Are Eyes From Flies the Future of Solar Technology? | Discoblog

eyesScientists are eyeing the future of solar technology–specifically, fly eyes. Turns out those bubbly-looking spectators might be just the ticket to more-efficient solar cells, researchers from Penn State University say.

Blowflies have peepers that would help solar panels collect light more efficiently, and creating these fly-eye molds was a feat in itself, according to Discovery News. After plucking the corneas from blowflies,

“The researchers took corneas, fixed them on a glass substrate, added a polymer to protect the shape and then coated nine-eye arrays in nickel within a vacuum chamber. The result was a master template that retained those useful nanoscale features. Ultimately that template can be used to replicate the pattern exactly.”

As they say, 30 eyes are better than one. Accordingly, the researchers next plan to create a template using 30 fly corneas.

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Image: flickr / Thomas Shahan


“Thor” Mixes Science With Magic, But Science Wins | Science Not Fiction

Though Thor is the story of a god who crushes his enemies with a magical hammer, Kenneth Branagh’s Thor movie is set in a scientific universe. Or so it seemed from footage we saw this weekend, especially of Destroyer.

Branagh, whose previous films include Frankenstein and Dead Again, is known for over-the-top theatricality and an emphasis on acting in his films. The 3D Thor is no exception, especially since the director says he loved Thor growing up and has even worked to include different versions of the first Avenger in his film. Though the hero’s iconic hammer is pure Jack Kirby, Branagh assured the audience that “there are some Donald Blake touches” too.

Natalie Portman plays Jane Foster, a minor character in the comics who has a very large role in the movie. She called her character a rare “real, frazzled, grounded female scientist – not the low-cut lab coat and sexy glasses kind of thing.” She added that she was happy to get back in front of a green screen with an actor-oriented director like Branagh, because “working with green screens is a skill – it should be something you learn in acting school.”

Chris Hemsworth is the perfect physical type to play the god of thunder, and when we saw the sizzle reel from the film, I was immediately sold on Hemsworth as much more than just a pretty boy who looks good shirtless. We saw him in both action scenes and in tense, intimate moments – and he burned up the screen. Especially when he finds the hammer hidden at the heart of a secret New Mexico military installation and lets out a mega-shout to heaven.

His damaged younger brother Loki is played by Tom Hiddleston, the god of mischief who turns into a major badass who wears black fetishwear and big horns on his head. Hiddleston says Loki’s main issue is that “he was the guy who was almost the guy, but wasn’t.”

Before we get into the footage, let me say that the 3D was good. It didn’t feel intrusive, but at the same time we got a lot of fun squirts of fire aimed out into the audience – plus, of course, some hammer throwing. And the 3D made the sets really pop, giving the whole flick some texture. I’m usually the first to grouse about the overuse of 3D but I think Thor earned it.

So what was so sciencey about the footage we saw? First of all, the emphasis was on the secret industrial-science facility where Thor is being held by clueless fed types for part of the movie. Plus, when Thor is hurled to Earth by Odin, who casts the young god out for his arrogance and penchant for war, we see a shot that looks remarkably like something out of a scifi movie. We zoom toward the galaxy from a great height, as if Thor’s home Asgard is in another galaxy rather than being some kind of god dimension. Also, Asgard itself looks more like one of those really gorgeous Alderaan-style planets from Star Wars rather than heaven.

Jane is the person who finds Thor when he crashes to Earth, so Thor is immediately treated like a scientifically-discoverable thing rather than a mystical presence. (There’s also a nice moment of quippery where Jane tells her sidekick that “for a homeless guy, he’s pretty cut.”) And we hear him explaining to Jane that he comes from a place where “magic” and “science” are indistinguishable. This does nothing to quench our feeling that this is a scientific universe – it’s just that the Asgardians have science that’s advanced enough to be indistinguishable from magic.

So I know what you want to know: What about the hammer fighting? Was it awesome? Hell yes. Like I said earlier, there’s a great moment when Thor finds the hammer Mjolnir, pulls it from a pile of muddy rock, and lets out a cosmic yelp. Then we see him fighting a variety of enemies, including brother Loki and his fetishwear-clad Asgardian corps, who have taken over Asgard after the death of Odin. He does a good hammer throw, and the hammer manages to look both cartoonish and kickass at the same time.

We also got a glimpse of Hemsworth doing the steely eye when he’s being interrogated by a fed at the secret facility, who accuses him of being a highly-trained mercenary. I like the look of our mercenaryesque god in that scene: Human, but with a glint of godhood in his eyes.

The other ultra-awesome part of the sizzle reel was meeting Destroyer, who looked like a medieval version of Gort from the original Day The Earth Stood Still. He stands a few heads taller than a human, and when he arrives the Feds mistake him for “unauthorized military technology” and ask him to stand down in bored tones. Then he opens all the layered vents on his suit and his face plates open to reveal – emptiness, shortly filled with a surge of fire. Again, it feels Gort-like, but also terrifically old school, as if he has a dragon breath weapon.

I was left feeling like this film would be a pleasure to watch, full of awe-inspiring visual flourishes, great acting, mega-battles, and funny, tight dialogue. A perfect superhero treat.

io9logoThis post originally appeared on io9.

io9. Escape to the world of tomorrow.


NCBI ROFL: Oral malodor and related factors in Japanese senior high school students. | Discoblog

2788759213_089d57b892_b“Oral malodor (halitosis or bad breath) might be an important motivation tool for improving oral health in adolescents. There are few studies that report the epidemiology of oral malodor in high school students and the relationships with lifestyle and oral health status. This research was conducted to obtain underlying data for introducing an oral health education program which targeted prevention of oral malodor as a motivation tool for changing oral health behavior in high school students. METHODS: A questionnaire, school oral examination, and oral malodor measurement were conducted on senior high school students in a Tokyo metropolitan school in 2007. A total of 474 students (male: 219, female: 255) were used for the analysis. RESULTS: Over 42% of subjects reported that they had experienced anxiety, or were conscious of oral malodor, on at least 1 occasion. The students who had detectable oral malodor comprised 39.6% of subjects. The binary logistic regression analyses showed that whether or not subjects ate breakfast before the oral examination (p < .05), the presence of plaque (p < .01), and presence of a substantive tongue coating (p < .01) were related to the presence of detectable oral malodor. CONCLUSIONS: Cleaning the oral cavity and eating breakfast are important to prevent oral malodor in high school students. This study indicated that school health education incorporating prevention of oral malodor as a motivation tool for oral health promotion could be a valuable procedure to include in high school dental health education programs.”

Bonus quote from the Materials and Methods: “The organoleptic test method described by Rosenberg was used in this study. This method requires the subject to sit behind a privacy screen and expire air through a paper tube placed through a hole in the screen. The examiner smells the expired air from the other side of the screen and evaluates the odor produced… Oral malodor was recorded as: 0 = Absence of odor; 1 = Questionable malodor; 2 = Slight; 3 = Moderate; 4 = Strong; and 5 = Severe.”

japanese_high_school_halitosis

Photo: flickr/Kitt Walker

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WTF is NCBI ROFL? Read our FAQ!


Researchers in Greenland Drill 8,000? Down to Study 120,000-Year-Old Climate | 80beats

bedrockResearchers camped on the Greenland ice sheet hit bedrock this week after almost three years of drilling, reaching a depth of 8,000 feet. They hope that the ice they’ve uncovered from some 120,000 years ago, might give them a better understanding of what a warmer future might look like, if Greenland has less ice and the sea level rises.

The team, which is part of the North Greenland Eemian Ice Drilling (NEEM) project, is looking to learn more about carbon dioxide levels during the Eemian period, when global temperatures were over 2-3 degrees Celsius warmer and sea level was about 15 feet higher. They believe these conditions might mirror effects caused by the earth’s changing climate during the next century.

Scientists believe that by the end of the 21st century the planet will experience similar conditions again. Over the Greenland ice sheet, temperatures at the height of the Eemian may have been around 5 degrees Celsius warmer–mirroring the Arctic amplification of modern climate change. . . There are large uncertainties concerning the response of ice sheets to warming air and ocean temperatures. Understanding what happened to the Greenland ice sheet during the Eemian could help constrain projections of future sea level rise. [Nature]

The 120,000-year-old piece of ice retrieved this week was once snow. After about 200 feet worth of more snow piled on top, the pressure transformed that snow into ice, at the same time capturing atmospheric air in bubbles still present. Researchers hope to analyze the air inside to get the first Northern Hemisphere record of the carbon cycle from this period, by looking for concentrations of carbon dioxide in the bubbles.

Modern techniques that simultaneously measure selected chemical components, CO2 gas and CO2 gas isotopes. . . allow us to produce a high resolution CO2 record for Greenland. The record will be the first Northern Hemisphere record that provides information about the cycling, sources, and sinks of CO2. [NEEM project]

After removing outer layers of ice samples (to avoid contamination) researchers will melt or crush the ice (here’s a neat picture of the “crusher needles”) and then analyze the extracted air using laser absorption spectroscopy–researchers zap samples with laser light, and then measure the isotopic composition of the carbon dioxide that’s emitted. Additionally, researchers hope the samples might give them another glimpse of life that existed before the Eemian.

The last 2 m of ice above the bedrock contains rocks and other material that has not seen sunlight for hundreds of thousands of years. We expect the ice to be rich in DNA and pollen that can tell us about the plants that existed in Greenland before the site became covered with ice, perhaps as long as 3 million years ago. [NEEM project]

The team has also kept an online journal during their work in northwest Greenland. An excerpt from this week’s entry:

After a few runs with no penetration and totally grinded down cutters we made the decision to terminate the deep ice core drilling. We celebrated this with a glass of champagne in the drill trench and every nation present gave a small speech. . . . To imagine–it is done!! [NEEM journal]

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80beats: NOAA’s Conclusive Report: 2000s Were Hottest Decade on Record

Image: NEEM


Megameter chasm on an icy moon | Bad Astronomy

I know I haven’t been posting much astronomy the past few days — Comic Con, w00tstock, and "Bad Universe" have kept me hopping — so to make up for it a little bit, here’s a lovely image sent back a billion kilometers from Cassini:

cassini_tethys_canyon

This is Tethys, an ice moon of Saturn. The angle of Cassini, Tethys, and the Sun light the moon as a crescent. The most obvious feature is Ithaca Chasma, a (more than) thousand-kilometer-long gash in the side of the object. Note that Tethys is only about 1000 km in diameter, so the chasm runs along a third of the moon’s surface (circumference = diameter x π, remember).

How big is that? Stand up and take a long stride. That’s about one meter. Now do it 999,999 more times. That’s a megameter: a million meters, or 1000 kilometers. Better pack a lunch.

The chasm is billions of years old, and may have formed when water inside the moon froze, expanded, and cracked the surface open. It’s a hundred kilometers across and 3-5 km deep, too. It’s far larger than the Grand Canyon, the largest canyon on Earth.

Space is big, and weird, where even small objects have huge features. It’s surprising, but surprising things are the best things to know.

Tip o’ the dew shield to Carolyn Porco.


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Shooting a Plane in One of The Quietest Places on Earth | Visual Science

An RQ-4 Global Hawk Block 20 aircraft hangs inside the Benefield Anechoic Facility at Edwards AFB 6/30/08. RQ-4 Global Hawk is a Remotely Piloted Aircraft (RPA) used by the United States Air Force and Navy as a surveillance aircraft. “R” is the Department of Defense designation for reconnaissance; “Q” means unmanned aircraft system. The “4″ refers to it being the fourth of a series of purpose-built unmanned aircraft systems (UAS).

The Global Vigilance Combined Test Force concluded an electromagnetic profile study for the Global Hawk Block 20 at the Benefield Anechoic Facility in summer 2008. The three-week study marked the first time the test force used an entire Global Hawk aircraft for testing inside the anechoic facility.

“We are testing the aircraft at the BAF (Benefield Anechoic Facility) because we have a sealed chamber, which allows no radio frequency to come into or go out of it,” said 2nd Lt. Christopher Stilson, 772nd Test Squadron project lead engineer. “We are completely sealed off from the outside world and interferences, such as cell phones and radios, which sometimes make it hard to separate the aircraft’s radio frequency from the environment.” The result of this testing is part of the Federal Aviation Administration requirement for the Global Hawk’s airworthiness certification. “It is a certificate required by the FAA to allow an air vehicle to fly in the national airspace,” said Ed De Reyes, Northrop Grumman EMI Test Lead. “Because the Global Hawk is an unmanned aerial vehicle, the FAA is requiring a higher standard for the aircraft.”

Photographer Jet Fabara had this to say about making this shot: “When I first arrived at Edwards Air Force Base, the only fact I was given about the BAF was that it was used in the movie Armageddon and that if I ever had the opportunity to take photos inside the facility it would be different than any other building I’d shoot in. To give you a better idea of the building’s scale, when the BAF was being constructed in 1988, the heart of the facility would be the largest electromagnetic-free environment for flight test programs like the B-52 and C-17 at that time. Since the interior of the test facility is suppose to simulate “free space,” any person that enters the BAF will always tell you that testing in the BAF is like testing in a sound proof booth.”

“The first time I entered the BAF, I remember feeling like I underestimated the size and dimension of the entire facility. Once the facility’s doors close, there is a complete sense of seclusion from the world. The blue stalagmite- and stalactite-looking material that surrounds every facet of the interior creates a cave where noise becomes completely absent. The most interesting thing about documenting inside the BAF is that I had never seen aircraft suspended from the ceiling of a building before. I’d seen aircraft in the air, inverted and banking, but never hanging. The day I was called out to document the RQ-4 in the BAF, I was also impressed at how the wings spanned across the width of the facility.”

Courtesy Jet Fabara/USAF

Isolated in the Farallons, Biologists Have Bizarre “Island Invasion Dreams” | Discoblog

sealScientists stationed on Farallon Islands, which has one of the world’s most delicate ecosystems, don’t just keep tabs on native species such as sea lions and puffins–they’ve also have been recording their dreams for the past two decades. The findings? Dreams that are “eerily similar,” according to the San Francisco Chronicle:

“Whether scientists are on the island for a few weeks or… stationed there on and off for a decade, their dreams are filled with marauding kids, terrified shorebirds, forest fires, shark attacks and a healthy dose of the absurd.”

It makes sense that scientists stationed there would have some pretty wacky dreams; after all, they go with essentially no human contact for many weeks on end, and are kept company by not-so-ordinary neighbors such as whales, sharks and up to 500,000 birds. The dreams have been dubbed “island invasion dreams.” The Chronicle describes one such dream:

“One scientist dreamed the biologists played the cormorants in a game of hockey on West End Island, cheered on by a crowd of drunken elephant seals. Another dreamed that interns were thrown to the great white sharks that circle the islands during seal breeding season. Biologist Pete Warzybok once dreamed he saw a flamingo on the island, and then he was suddenly riding in his father’s old 1961 Buick. Next a bum began cleaning the windshield with spit and a dirty rag.”

That leaves us wondering: Do the animals on the island have nightmares about the scientists stationed there?

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Image: flickr / ucumari


Flushed with pareidolia | Bad Astronomy

Pareidolia is the psychology term for seeing faces in random patterns. This usually gets air time due to some vaguely Christlike shape in a stain or something, but not every instance has to be religiously motivated. I don’t want to ignore those secular ones, because, after all, I hate to let anything go to waste.

Behold!

toileteidolia

This picture, taken by Mitchell Whitney, was snapped right after an, um, incident that required some vigorous plunging. The only conclusion is that the toilet itself was relieved when it was all over as well.

I have a series of puns all trying to push their way out of my brain, but I’ll let them go because it’s been an exhausting week. I’m pooped.

Tip o’ the plumber’s helper to Dan Durda.


Are you the center of the Universe? | Cosmic Variance

One topic which generated a lot of discussion at the Gravity and Cosmology meeting was the void model of the Universe. The basic argument is simple: the dark energy is an ugly addition to our cosmological standard model, with 70% of the energy density of the Universe some mysterious substance with weird properties. From a theoretical perspective, dark energy has the wrong density by many, many orders of magnitude, and worse, we may never be able to study it directly in the laboratory. Now suppose I told you I had a model which explained all of the observations, was based on general relativity, and appealed to no mysterious dark energy component (but still has dark matter, unfortunately). Sounds tempting, right? This is precisely what John Moffat, Chris Clarkson, Antonio Enea Romano, Chul-Moon Yoo, and others were advocating at the workshop (Kenji Tomita has also done a lot of work on this; the model has been around for decades). There’s one important caveat, however. The void model throws out the homogeneity and isotropy assumption. The Universe is now spherically symmetric, with a big hole in the middle. Even worse, we happen to be very, very close to the center of the hole.

ptolemyAs I discussed in a previous post, John Moffat argues that we shouldn’t be any more disturbed by this model than the standard model, because they’re both anti-Copernican: the void model in space, the standard model in time. As I discuss in that post, I’m not sure I completely agree with this. The fine tuning for the average void model is fairly involved. First, the matter density must be carefully set, as a function of radius, to agree with observation of the luminosity-distance relation. Then we have to be set down within roughly 1 Mpc of the center of the spherical void (which is at least a few Gpc on a side). If we were at a random spot in the Universe, there’s a probability of much less than 1 in 10 billion that we’d end up sufficiently close to the center of a void (assuming such voids existed). On the other hand, the standard Lambda CDM model of cosmology requires fine-tuning of the cosmological constant to a tiny, but non-zero number. To some this is unbearably ugly. But, at the end of the day, it’s just one additional, arbitrary number.

All this being said, what’s great about void models is that they aren’t just a philosophical alternative to the standard model. This is physics. There are measurements that can be done to differentiate (and possibly falsify) these models. Stebbins & Caldwell have come up with one particularly interesting approach, exploiting the fact that “random” observers in a void model see a different sky (and hence, a different CMB) from the one we do in our privileged position. It is surprising that a model so radically different from our standard model is still viable (although under pressure). Tests over the next few years are expected to distinguish these models, and we’ll know definitively whether we are at the center of the Universe.


Solar Probes Facing Death Sentences May Get Second Lives as Moon Probes | 80beats

153236main_THEMIS_medThey went to investigate solar wind-stirred storms in our planet’s magnetic field, but, after working for three years, two NASA solar-powered probes faced a dark demise, trapped in the Earth’s shadow. NASA researchers now think they can give the twin satellites another shot by altering their courses and sending them instead to study the moon.

NASA launched the probes in 2007 as a set of five identical satellites in the THEMIS Mission (Time History of Events and Macroscale Interactions during Substorms), meant to orbit Earth and send information during brief (2-3 hour) “substorms” when the magnetic field surrounding the Earth releases stored energy from solar winds. To understand the start of these “space tornadoes” responsible for the northern and southern lights, NASA placed the probes in very precise orbits, but for two craft that meant, one day, they would face prolonged battery-draining time in the Earth’s shadow.

“When we realized that the satellites would be going into very deep shadows, we started thinking of different methods for saving them–even before they were launched,” lead scientist Vassilis Angelopoulos, at the University of California, Berkeley, told Discovery News. “We realized that if we had enough fuel to change their orbits, the moon’s gravity would start pulling them up.”[Discovery News]

As Discovery News reports, funding is still pending for the new mission called ARTEMIS (Acceleration Reconnection and Turbulence and Electrodynamics of the Moon’s Interaction with the Sun), but the two satellites are already moonward bound. By firing their thrusters to extend their orbits, scientists started moving them closer to the moon in September of 2009, New Scientist reports. If the mission gets final approval, the recycled probes will move into position 62 miles in front of and behind the moon (relative to the Sun), and will give researchers a look at how the moon’s magnetic fields interact with solar winds.

The gravitational slingshot effect from these lunar encounters, as well as the probes’ close passes near Earth, changed their trajectories drastically – you can see the technical details [and artist renderings] here (pdf). Their own thrusters should be able to do the rest of the job, putting them in orbit around the moon in 2011. . . Not bad for two spacecraft that would have been space junk by now without this creative rescue plan.[New Scientist]

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DISCOVER: Space Weather explains the damage that solar storms can wreak

Image: Artist’s concept of original THEMIS in orbit. / NASA


Notes from the Field: A Sticky Situation | The Intersection

This morning David and I got up much too early to drive out to hill country in order to collect switchgrass. It was hot, sunny, and muddy, but mission accomplished! On the ride home, we noticed thousands of baby spiders crawling around the back seat, but fortunately, it was his car.

220px-BurrsNow to clean up before the afternoon meetings. But first, a question:

During the adventure, our pup got covered in little sticky burrs. I’ve already pulled out several dozen by hand and begun the tedious task of removing the rest with scissors. So I turn to our dog experts out there…

Do you think it’s worth cutting them all out, or will they fall away eventually on their own? Advice welcome and appreciated!


This Is Worse Than Orson Welles

Position of the planets on August 27, 2010. Click for a larger version

The Mars Hoax is beginning to make the rounds again.  It just won’t go away.  I’m sure you’ve heard it.  Mars is going to be the closest it will ever be (or some such claim) and it is going to be as large as the full Moon on August 27th!  I’ve even heard all this was going to take place at 12:30 am “so get your cameras ready” and they were going to be close together, oh what an event.

Here’s the real deal.  No-No-No-No!!  Just go ahead and Google for The Mars Hoax or use any other search engine you please.

Let me take a crack at it too:

Let’s do away with the last bit first.  Mars will not be above the horizon at 12:30 am on August 27th.  Pretty hard to get that great photo if the planet can’t even be seen eh?

The part about Mars being closest in who knows how long.  The image above (click to enlarge) shows the relative positions of the inner planets on August 27, 2010.  Note the orbital tracks in the image. The Earth and Mars are a long ways apart on that special day; in fact the next time we will be anywhere close to Mars will be in April of 2014 and we will still be  92,750,760 km or  57,632,650 miles apart!

Let’s compare August 27, 2010 data:

MoonMars
Diameter:3,476 km

2,160 miles

6,792 km

4,220 miles

Angular size:29′ 15″4.39″
Distance to:

(from Earth)

408,530 km

253,360 miles

320,000,000 km

198,838,782 miles

Magnitude:0.001.52

..

Now I know some of you are going “but Tom, your numbers aren’t exact”, yeah I know but they are pretty close.

You can see by not only the image, but looking at that little chart, the angular size (the apparent size of the pair), it’s not even close!  The magnitude shows Mars will be dimmer as seen by us – the Moon is going to be 90 odd percent full too.  Small and comparatively dim is not large and bright.

Could we on Earth ever see Mars as big as the full Moon?  No, but exactly would it take?

We would have to move Mars much closer to us.  In order for Mars to appear to be the same size as the Moon we would need to move the orbit in – a lot!  From 320,000,000 km to 801,000 km, (that’s from 198,838,782 miles to 497,670 miles for the metrically challenged).  Can you imagine what that would do to our tides, to say nothing about other things like rotational and orbital rate?

The other choice would be to move the poor old Moon so its angular size was 4.39″ to match Mars.  Moving the Moon from 408,530 km (253,360 miles) to a whooping 163,320,000 km (101,490,000 miles) away would do it.  I almost think that would be worse for the Earth than moving Mars closer.  I can envision the poor Earth spinning like a raw egg, ahhh, eggs and astronomy, no balancing needed.

So hopefully this will dispel any notion Mars and the Moon will ever appear to be the same size to any person in their right mind as viewed from Earth.

and….I do like Orson Welles ;-)

That Killer Asteroid You Heard About Yesterday? We Knew About It Last Year | 80beats

AsteroidsBeware death from above! So blared science headlines yesterday. Citing a study in the Journal Icarus that said a huge asteroid perhaps could have a 1 in 1,000 shot of striking earth late in the next century, stories broke such as,

Will a Giant Asteroid Kill Us All in 2182?

Asteroid Could Destroy Human Life on Earth by 2200

Huge asteroid on possible collision course with Earth (172 years from now)

Mark your calendars: Potentially hazardous asteroid might collide with Earth in 2182

They’re correct in that there’s a giant asteroid out there called 1999 RQ36, and there’s a small chance it might hit us in a just less than couple hundred years. There’s just one problem: It isn’t news, though you wouldn’t have gotten that from the articles. The study everyone is referring to came out last year—it was in Icarus last October.

Confused why there was a press release yesterday that blew up into this wave of coverage, I emailed study coauthor Maria Eugenia Sansaturio of the Universidad de Valladolid in Spain to see if there was anything new to report about the asteroid. Her reply:

The answer to your question is that there is nothing new. I’m still trying to understand how this has made it to the international media. I was contacted by the Spanish Foundation for Science and Technology because they wanted to prepare a report on it and inform the Spanish Media, even though the article had been published in 2009…. and here I am overwhelmed with mails and phone calls from all over the world!

So the risk from 1999 RQ36 isn’t exactly new (and the press release in English caught Sansaturio by surprise, to say the least). Apparently, she says, the study just now got on the SFST radar, and that organization’s release set science publications humming about killer asteroids.

But, whether this asteroid’s path is old news or not, we shouldn’t dawdle in thinking about how we might avoid it or asteroids like it. In this case, we’ve only got 172 years—and we already wasted one year getting the news out.

172 years into the future is a long time, and humans aren’t exactly well-known for preparing for future events over those kinds of time scales. But time is one thing we’ll need if we are to protect future generations from a potentially catastrophic impact event [Discovery News].

Of course, the last time there was a giant hubbub over an asteroid that might kill us all (we’re looking at you, Apophis), subsequently improved data all but ruled out a disaster. So don’t panic; grab a telescope.

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Image: ESA, NASA, JAXA, RAS, JHUAPL, UMD, OSIRIS (asteroids visited by spacecraft, created by Emily Lakdawalla)


On the Origin of Science Writers | Not Exactly Rocket Science

Writing
Every now and then, I get an email from someone who’s keen to get into science writing and wants to know how I started. Whenever I reply, and I always try to, I’m always left with the nagging feeling that my experience is but one of a multitude of routes that people have taken. Science writing (whether you want to call it journalism, blogging, communication and so on) is a diverse field, as are the people working in it. It would be far more illuminating for a newbie to see a variety of stories rather than just one.

This was the origin of this thread of origins. I will be asking science writers around the world to do what they do best – tell a story – about the thing they know best – themselves. This will be a perpetual thread that I hope will act as a lasting resource for the writers of tomorrow to take inspiration from.

Some kind individuals have already submitted their stories and I hope that many more will chip in. You can already see that they’re a varied bunch. Some stumbled into it by accident. Some came from traditional journalistic backgrounds. Others were bitten by a radioactive Carl Sagan. The more the stories accumulate, the better this diversity reveals itself.

Who should contribute to this thread?

Anyone who regularly writes about science, and preferably has been doing it for a couple of years now. I originally wanted to focus on science journalists but because all these definitions are bleeding into one, I’m opening it to all manner of science writers. From blogger to book writer, beginner to veteran, Asimov to Zimmer, tell us your story.

What should I say?

You’ll see from the existing entries (which are virtually unedited) that there’s a lot of variety in content, tone and length. This is as it should be – science writers are a diverse bunch and it would be a shame to edit them into uniformity. But essentially, there are two basic questions:

  • how did you make your start
  • what advice would you give to people in the same position?

What do I do?

Just stick a comment in with your story, who you are and what you do. If there are multiple links, it’ll be diverted to my spam folder, but just email or tweet me and tell me to rescue it. Alternatively, feel free to email your story and I’ll put it up on your behalf.

How do I tell people about this?

Obviously, the URL is above, but you can also link to this page from tinyurl.com/sciwriters and bit.ly/sciwriters

What about regular comments?

I’m not going to restrict people from posting regular comments initially, but I’d ask that readers keep them to a minimum. The thread’s value relies on the stories taking centre-stage.

Other than that, go for it.

Who has contributed?

I’ll keep a running list here, with links to their stories:


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Lunar triple sunset | Bad Astronomy

I never get tired of the stunning pictures being sent to Earth from the Lunar Reconnaissance Orbiter. This one is particularly cool:

bhabha_sunset1

It’s a little weird, isn’t it? What you’re seeing is sunset over some mountains on the Moon, with only the peaks popping up into the sunlight. It might help to pull back a bit:

bhabha_sunset2

[Click to embiggen.]

That’s a little better. You can see the long shadows of the two mountains on the hills farther back, giving the image a bit of context and relief.

But you’re still missing the coolest part. Ready? Here’s the entire shot:

bhabha_sunset3

Whoa! Getting the picture now? Those three mountains are actually the central peaks of the crater Bhabha, a 64 kilometer (40 mile) wide impact scar on the far side of the Moon. With really big impacts, the shock waves bounce around inside the crater bowl, making the rock flow like a fluid. The rock flows outward, then sloshes back inward, splashing up to form peaks. Usually there’s only one, but Bhaba has three.

This shot is from the west, facing east. It was taken just minutes before the Sun set over the peaks, throwing them into two weeks of darkness — remember, the far side of the Moon gets light just like the near side; when we see a thin crescent Moon that means the Sun is shining down on the other side, just like day on one side of the Earth means night on the other.

This picture is a vivid reminder that the Moon is a world in its own right. Eventually, I hope, people will once again get to see views like this by simply looking out the window. Until that time, LRO will provide us with these amazing pictures.

Image credit: NASA/GSFC/Arizona State University


Sex Week continued: Water strider blues | The Loom

[This is my third post of Sex Week]

Here’s a song for the male water strider, from the days when Rod Stewart could do no wrong:

In my first two posts for Sex Week, I wrote about the delights of courtship: the alluring, informative fragrance of yeast and the seductive buzz of electric fish. These signals stir the opposite sex into action–to creep towards a fellow fungus, or to head-butt a prospective mate. But in many species, the actual consummation that all that courtship leads up to does not turn out to be a blissful union. Instead, some males will use all kinds of force and subterfuge to prolong their mating and raise the odds that their sperm fertilize their mate’s eggs. And the females? In some species, they very often just want to get away.

The reason for this unhappy union is pretty simple. In a lot of species, males compete with each other to fertilize the eggs of females. A single male makes so much sperm that he could, in theory, fertilize every female of his species. What limits his reproductive success is the access he has to females and their eggs. Females, on the other hand, are limited by how many eggs they can produce and rear. So it can pay for them to be choosy about which males they mate with. That doesn’t necessarily mean they pick one male, however; females in many species mate with several males, and there’s evidence that they can choose which male’s sperm to fertilize their eggs.

striders440I’ve written on the Loom before about the various forms that this sexual conflict can take, from love darts to bickering bird parents to bizarre duck genitals, but one of the most extreme cases of this unromantic behavior can be seen in your local stream. Water striders skate over the surface of water, using their legs to sense waves from their prey. When it comes time for mating, a male water strider will feel for the waves of females. He will skate–or sometimes even leap–to land atop a mate. Very often, the female will struggle to get away, but he will wrap his legs around her midsection. The two insects fight; she may try various judo-like maneuvers to get him off, while he holds on as best he can. A female may raise her metabolic rate by 200% as she battles the male. If the male manages to insert his phallus into the female’s reproductive tract, he inflates it to keep it in place. He will hold onto her as long as possible–in some cases, as long as twelve hours–to raise the odds that his sperm find her eggs, and reduce the time the female has to mate with other water striders.

This kind of behavior has evolved because it can, under some circumstances, bring male water striders more offspring. Water striders, like many animals, have different personalities. Some male water striders are aggressive, and some are hyperaggressive. They are so eager that they’ll jump on males as well as females.. A team of scientists at Binghamton University mixed together water striders with different personalities to see how they would fare in the mating game. They found that in a mixed group of males, the hyperaggressive water striders had greater success than their milder rivals.

If hyperaggressive males can pass on their genes so well, why aren’t all male water striders over the top? One reason may be that selection can have different effects on animals at different levels. At the level of individuals, hyperaggressiveness may give an edge. But water striders don’t live in isolation. They live in groups, gathering in isolated riffles or side-ponds in streams. If you look at groups of water striders, hyperaggression turns out to be a disaster for males. Hyperaggressive males wear females out with their wrestling. The females try to hide off the water, so that they can’t feed, and as a result they produce fewer eggs.

The scientists even found that females will sometimes just abandon their group and seek out another place to live, where the males aren’t so overbearing. The groups where milder males live are flooded with females, so that each male has more females to approach. As a result, groups of mellow males can have more offspring than groups that contain hyperaggressive water striders.

The battle of the sexes rages on, but the opposite effects of individual selection and group selection keep it in check.

[Image: macropoulos]


The Anglo Revolutions | Gene Expression

51TZ-cnJTrL._SS500_Over my lifetime in the United States there has been a shift toward a set of values which emphasize diversity, understood as being expressed along a few particular parameters: racial, sexual and ethnic. Part of the project is obviously concrete: increased representation of various segments within American society at the commanding heights of institutions and in positions to operate levers of power. But part of the project is intellectual and didactic. In the domain of history the past is reshaped and mined to create myths which serve as foundations for our understanding of how we got here, and why we value what we value. It is true that some reject the Founding Fathers as “Dead White Males,” and repudiate the history of the United States, and damn America. But others see in aspects of the founding project, and in the lives of the founders of the American republic, the roots of the modern liberal democratic order. Even the progenitors of multiculturalism. I would say that the latter position, of reappropriation and reinterpretation, is the dominant mode. But it is clearly myth-making. Those who repudiate the foundation of the American republic as a project of white supremacy, Eurocentrism, and ethnocentrism, have a great deal of reality to draw upon. The personal correspondence of men who were self-identified and perceived radical liberals for their time, such as Thomas Jefferson, attest to this reality.


And yet one can go too far in emphasizing this component of 18th century America. One hundred years ago, in 1910, the Zeitgeist was very different from that of today. The American founding was seen as a project of the unfolding arc of evolution, the fruition of the genius of the Nordic race. In this reading America was a fundamentally white Protestant republic rooted in the supremacy and domination of the white race over the colored races. Again, this goes too far, and reframes the late 18th century American elite as proponents of a scientific view of racial competition which derives in part from a post-Origin of Species inflected perception of the nature of things, and the rising tide of white supremacy which peaked in the years after 1900 with the apogee of colonialism. Certainly the American founders would have been understood to be racist today, but as outlined in works such as What Hath God Wrought: The Transformation of America, 1815-1848, the reality is that an explicitly race-based republic crystallized in the first half the 19th century in North America with the rise of democratic populism. As states removed property qualifications for voting, they enacted racial bars which had not existed prior. It is an interesting comment on the complexity of changing norms in this period that Martin van Buren’s vice president, Richard Mentor Johnson, was known to have had a common-in-law wife who was mixed-race (and two daughters by her whom he acknowledged). Van Buren’s Democratic party was the primary driver of “white male suffrage,” which expanded voting rights to those males who were without means, but barred voting rights in many states from non-whites. It helped transform the self-conception of the American republic to that of the American democracy. These two dynamics, the broadening of suffrage to most American males, combined with a more explicit and legally sanctioned commitment to white supremacy, causes interpretive tensions for 20th century American liberal historians. This seems clear in works such as Arthur Schlesinger Jr.’s The Age of Jackson, which attempted to trace American liberalism back to this period. So it is somewhat uncomfortable for him that it was among some of the older aristocratic conservative Federalists that one could find objection to a binary republic where color was one’s passport to equality. This is not because the conservatives favored racial equality as such, but rather preferred a more complex hierarchy and a set of values which included race, class, education and breeding, as the judge of a man. Such old republic conservatives may not have accepted a black man as an equal on the grounds of race, but they may not have acceded to the contention that all white men were superior in nature to all black men. They would not have necessarily fallen under the class of whites which Malcolm X referred to in regards to their attitudes toward blacks with education. David Cannadine covers the same attitude on race among the British masses in Ornamentalism, but in this instance the aristocracy managed to retain more cultural influence, and race did not overwhelm class. The maharajahs of India may have been black, but they were still aristocrats who were of a particular elevated station which demanded respect, if not necessarily deference.

All this is to highlight the fact that we perceive of history is filtered through the light of our normative frameworks, and in the process we miss much of what once was. Modern perceptions of white American racism are so strong that I suspect Richard Mentor Johnson’s private life would surprise us. As would the fact that Herbert Hoover’s vice president was nearly half Native American in ancestry. This is the sort of thing which I refer to as the “dark matter” or “dark history,” dynamics and phenomena which echo down to our age, but are forgotten because of the presuppositions which we promote today because of ideological preferences.* In the context of the United States of America one of the most important and overlooked threads of dark history are the separate Anglo-Saxon streams of settlement in the American colonies prior to independence. As outlined in Albion’s Seed: Four British Folkways in America they were the Puritans of New England, the southwest British gentry and their retainers in the lowland South, the Scots-Irish in the American uplands, and finally, the polyglot mix of Midlanders and other Europeans in the Middle Colonies. The thesis is that these patterns can explain much of the details of American history after the Revolution, and down to the present day. I have suggested that differences between Mormon and Southern white political conservatism can be traced back to different attitudes toward communitarianism on the part of New Englanders and Southerners. Mormonism was at its root a Yankee religion, with most of its early acolytes and followers derived from New England or Greater New England (western New York and the Western Reserve of Ohio).

This sort of detail of distinction is lost in our discussion of American ethnicity. The idea that whites, or at least “non-ethnic” whites, “have no culture,” gets at the root of it. What is assumed, what is background, what is default, is not deemed worthy of history. When it comes to Anglo history and culture the commanding heights remain of interest, William Shakespeare, the King James Bible, the Magna Carta, etc. But much of the more mundane detail is of little general interest compared to the more salient identities of race, religion, and such. I believe this causes real pragmatic problems. White Angl0-Americans from the North may find Southern whites of an alien kind, lacking community spirit, belligerent, but they have no essentialist explanation which can explain this as a product of a different historical experience, because this aspect is not emphasized in our minds. But the greater propensity to violence by Southern whites was noted by Northerners as far back as the 1840 Census, where the data were fertile fields from which Northern polemicists drew in frame their attacks on the morals and character of the Southern states. Northern whites may seem to be liberals driven to bizarre and irrational flights of fancy to Southerners, but this is nothing new, as far back as the early 19th century Southern observers noted the Northern fascination with “-isms.” Many of the deep chasms in American history go far back indeed, and impact those of us whose families arrived far later. As a South Asian whose formative understanding of American history was derived from a Northern perspective, it is peculiar to talk to South Asians who grew up in the Deep South who have a more “nuanced” view of the Civil War (taking my hat off of objectivity, the descendants of those who arrived in the South after the Civil War, and are not black, do not always understand that the Southerners were traitors, and that the side wearing blue were the Good Guys).

But why be Americo-centric? We can widen the canvass out far more. America was not the only settler society. Canada, Australia and New Zealand were also settled by British. South Africa and the highlands of Kenya were also settled by the British. The differences and similarities between the British settler societies can tell us a great deal about the history of the English-speaking people, and therefore the history of the world up to this point. That is the subject matter of Replenishing the Earth: The Settler Revolution and the Rise of the Anglo-World, 1783-1939. This is a history of migration, of migrants, and of the rise of the Anglo-Saxon civilization. Numerically in 1780 there were 12 million English speakers. In 1930 there were 200 million! Obviously not all of that was due to demographic growth, but much of it was. In New England we know that the vast majority of the ancestry of the hundreds of thousands who were alive on the eve of the Revolutionary War were descended from the 20,000 or so who arrived in the 1630s. The fecundity of New Englanders was legendary in the 19th century, as they spilled out of the east and overran western New York, and later the Great Lakes region. This was the long boom of the Anglo peoples. But it was also the era of the busts. And it was the era of equilibriums.

The core thesis of Replenishing the Earth is that the rise of the Anglo societies has been characterized by a series of booms, busts, and often-times recoveries from those busts as regions and populations settle into a quiescent phase. In this the author, James Belich, suggests that the Anglo people prefigure the dynamics which are operative in the world today, the post-Malthusian reality of presumed & expected economic growth, of sunny futures, and a Whiggish sense of the possibilities of what could be ,what will be. He describes nothing less than a revolution of imagination, which subsequently drove the material changes we see around us.

A bigger context which hangs over this are debates about the economic lift-off (sometimes termed the “Industrial Revolution”) which has characterized much of the world over the past 200 years. The noncontroversial part is this: some societies over the last 200 years have developed to the point where they are not characterized by uniform subsistence, and have some level of mass affluence. Before 1800 no society had mass affluence, and all societies were Malthusian. Yes, wealthy people existed, but generally they lived off the labor and output of the productive masses, who managed to barely get by. In Replenishing the Earth the author notes that some economic historians believe that all of Europe as a whole engaged in this lift-off simultaneously, while others suggest that Britain was first, with Belgium second. He favors the idea that Britain was first, and that other European societies were later additions to the club of wealthy nations. Like Greg Clark in A Farewell to Alms James Belich indicates that there was something special about Britain, and England in particular, and like Clark he rejects purely institutional explanations. Additionally, he also seems skeptical of the idea that England’s position near North America (resources and land) along with its strategic coal reserves can be the total explanation for its lift-off. Though the description of the phenomena which led to the Anglo-world is crisp, a series of booms, busts and static phases in sequence, the root of the historical dynamic seems rather vague. The best I can come up with is that the English were the first society to reconceptualization the possibilities of the future, and engage in settlement activities which might seem irrational or foolhardy in the past.

The extent of the booms shocked even me, in part because I was only aware of the American experience. In Replenishing the Earth there is a distinction between incremental endogenous growth (e.g., New England in the 17th and 18th century), and explosive booms driven by exogenous migration (e.g., New England in the 1840s and 1850s). I had not thought in detail about the difference between these two, but the distinction is important in hindsight. One of the more surprising things to me about American history before the independence of the colonies and the emergence of the United States of America is that it was not always easy to draw migrants to the New World. Now, one might not be surprised during the initial decades, but throughout the 17th century the flow of migration was halting, and generally low. The massive burst into New England in the early 17th century was famously driven by religious conflict in England, as an anti-Puritan faction was ascendant. Much of the migration actually reversed with Oliver Cromwell’s victory, as many Puritans removed themselves back to the motherland, but enough remained to serve as the core of a growing set of colonies who slowly pushed themselves into the frontier through native population growth. The situation in Canada was famously more difficult, as attracting settlers was nearly impossible. Part of the reason was probably that unlike Great Britain the French banned the emigration of religious dissenters. The large enterprising French Protestant minority in the 17th century probably would have left for the New World if they had had liberty to do so, but settlement in Canada was limited to Roman Catholics. As it is, many French Protestants settled in the British colonies. Franklin Delano Roosevelt’s mother was from such a French Protestant family. They had settled in Calvinist New Netherlands early on.

After independence, and to a lesser extent in the decades before independence, many immigrants did come to the United States. But note how variant the numbers were by year.

fig1

Many of these variations correlate with economic booms & booms. But one of the most fascinating hypotheses proffered in Replenishing the Earth is that migration and population growth often preceded economic booms we read about. An example of this is the California Gold Rush. The author asserts that migration had already increased in the years before, and that the resource driven attraction only emerged after the initial stream had become established. It seems here that he’s positing a sort of positive feedback loop: more people results in more opportunities and perceived opportunities. In the case of asset speculative bubbles these gains may be illusory, but when it comes to concrete natural resources the increased population naturally has a better prospect of detecting or utilizing them. Once mines are discovered a chain reaction can occur whereby word gets back, and a massive wave of migration ensues. But even here quite often the migration will continue after resource exhaustion. California may have run out of gold, but its climate and population was such that other economic activities filled the vacuum. California firms raised fruit and created a demand for orange juice in the rest of the United States once transportation and preservation were up to snuff through a proactive marketing campaign.

It is here that the rise of an Anglo international order is critical. The colonies in North America, Australia, New Zealand, and lesser extent South Africa, were dependent on the mother to buffer them during the collapse, and support their faltering economies through export oriented growth. The United States was an empire in itself, so that California could look to New York and the east as its own motherland. There is a fair amount of economic literature that in reality colonies do not usually pay for the home country. Rather, quite often the colonials depend on the military power, and economic demand pull, of the motherland. Prominent colonial lobbies emerge and engage in an ideological, nationalistic, appeal to the tax-payers of the motherland. It is often said that much foreign aid today is a transfer from the middle classes of developed nations to the elites of developing nations, and in some ways this is analogous to what is argued for colonies. Speculators, promoters, and incipient elites are strongly invested in as much transfer of wealth from the mature motherland to the frontier. During the first age of globalization around 1900 the United States was a debtor nation which absorbed a great deal of cash from the United Kingdom. This illustrates that even despite the fact that the USA was no colony, ties and affinities of nationality, combined with the idea of explosive returns during boom times, attracted British investors. Apparently the econometric literature indicates that in fact British investors would have done better investing in the home country, rather than in the USA or the colonies.

In Replenishing the Earth the argument is repeatedly made that these national affinities, ramping up of pre-industrial technologies and industrialization, and a particular shift toward an expansive, dominionist ideology, all aligned together to produce an Anglo breakout. Other nations had had extensive colonies, and even non-trivial settlement, such as Spain. But all had stabilized at a far lower, less explosive stationary state. It may be that England’s growth was a matter of happenstance, that the technological and ideological conditions were not ripe during the age of Spanish colonial expansion for them to transform their domains into anything more than a pre-modern empire, such as the Romans, Arabs, and Chinese had had. Incremental, ideologically dominant, but not explosive and revolutionary.

But revolutions come to ends. The most surprising fact I encountered in Replenishing the Earth was that in 1890 Melbourne was the second largest city in the British Empire, after London, with 500,000 people! This was at the peak of a massive speculative boom, right before a bust. Over the next 50 years Melbourne grew only another ~50% in population! During boom-times prognosticators asserted that Australia was destined to have 100 million by 1950. That New Zealand was destined to match the mother country in population within two generations. These hopes were dashed by reality. It seems clear that Australia had ecological limits which were reached, as agriculture could only be so productive in the Murray-Darling basin. Britain’s own demographic expansion abated, so it could no longer provide so many migrants. And so forth. Linear projections fail more often than not. The future is full of surprises.

For me one of the interesting points was reading about past manias and bubbles, engendered in part by more efficient information technology, expectations of constant future growth, etc. It is likely that much of the Replenishing the Earth was written years ago, but many of the English-speaking nations went through irrational property bubbles in the 2000s. The USA and Britain predictably shared home-related television shows. James Belich warns repeatedly about excessive reliance on rational choice theory, and the assumption that the market price is an accurate reflection of all information. History repeats itself over and over, the information is clear in the record, and yet human optimism overcomes. To some extent this optimism, Whiggish, may have been necessary to sustain the economic productivity growth. But in some sense it was profoundly irrational, as all of human history teaches that one can never escape the iron laws of natural constraint.** Once the first boom-bust cycle occurred, the pattern was set in motion. Fortunes were to be made and lost, and those who had relocated, migrated, and uprooted themselves, were far more likely to do so in the future, or inculcate in their offspring the ideology whereby such migration was acceptable, expected, and meritorious.

Finally, the rapid change, and the stasis, in culture, economics and political order, makes me thinl of biological analogs, in particular evolutionary ones. We hold it as a matter of faith that nature is real, that in some sense the laws of the cosmos are bound as one, with each specific instantiation a reflection of some underlying principle. The peculiar similarities which a macroeconomist may feel when reading R. A. Fisher’s The Genetical Theory of Natural Selection is one case. The rise and fall of frontiers, with epidemics of manias, the cycles of enthusiasm, migration, and population growth, remind one of the shape of Lotka-Volterra equation. Replenishing the Earth may be a dense work of economic and cultural history, but in some very important ways it gives us a window into general phenomena which percolate through the order of things.

* Here’s a case of inversion: in the early 20th century ideologues turned the roots of all civilizations into examples of Aryan/Nordic superiority. Today from what I can tell the mainstream sentiment is to not comment or inquire too deeply into the Afrocentrist fiction that St. Augustine, Hannibal or Cleopatra were black. A fiction which from what I can tell has spread widely within the African American community. How the pendulum has swung!

** I understand that some readers feel we are facing those laws now, fair enough. The point is that much of humanity had nearly a 200 year respite, which is not trivial.

Bad Weather Here

Okay, rather than risk losing my computer completely, I’m going to wait and publish about neutrinos tomorrow.

Sorry,  I know you’ll understand.

Extremely bad weather here!

NCBI ROFL: I SAID, I THINK YOU’VE HAD ENOUGH TO DRINK!!! | Discoblog

alcohol researchThe acute effects of alcohol on auditory thresholds.

“BACKGROUND: There is very little knowledge about alcohol-induced hearing loss. Alcohol consumption and tolerance to loud noise is a well observed phenomenon as seen in the Western world where parties get noisier by the hour as the evening matures. This leads to increase in the referrals to the “hearing aid clinic” and the diagnosis of “cocktail party deafness” which may not necessarily be only due to presbyacusis or noise-induced hearing loss. METHODS: 30 healthy volunteers were recruited for this trial which took place in a controlled acoustic environment. Each of the individuals was required to consume a pre-set amount of alcohol and the hearing was tested (using full pure tone audiogram) pre- and post- alcohol consumption over a broad range of 6 frequencies. Volunteers who achieve a minimum breath alcohol threshold level of 30 u/l had to have second audiogram testing. All the volunteers underwent timed psychometric and visuo-spatial skills tests to detect the effect of alcohol on the decision-making and psychomotor co-ordination. RESULTS: Our results showed that there was a positive association between increasing breath alcohol concentration and the magnitude of the increase in hearing threshold for most hearing frequencies. This was calculated by using the Pearson Regression Coefficient Ratio which was up to 0.6 for hearing at 1000 Hz. Over 90% of subjects had raised auditory thresholds in three or more frequencies; this was more marked in the lower frequencies. CONCLUSION: Alcohol specifically blunts lower frequencies affecting the mostly 1000 Hz, which is the most crucial frequency for speech discrimination. In conclusion alcohol does appear to affect auditory thresholds with some frequencies being more affected than others.”

alcohol hearing

Photo: flickr/robad0b

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