Freezing Your Head May Anger Your Wife | Science Not Fiction

thaw when is future plzConsidering cryonics? Before you sign up to freeze yourself — or just your brain! the whole thing (you) might be overkill–after you die so that you can be unfrozen and then un-deadened in the future, you might want to consider your current relationships. As it turns out, a lot of those who plan to go into cryonic suspension when they are “deanimated” have trouble with their loved ones, primarily wives. In Kerry Howley’s NYT Magazine piece “Until Cryonics Do We Part” about Robin Hanson, a George Mason University economics professor and forward thinker, and Peggy Jackson, a hospice worker and Hanson’s wife, we get a glimpse of the tension wanting to live forever can cause. You see, Hanson wants to cryonically preserve his brain, and Jackson thinks that idea is a bit absurd.

And she isn’t the only one:

Among cryonicists, Peggy’s reaction might be referred to as an instance of the “hostile-wife phenomenon,” as discussed in a 2008 paper by Aschwin de Wolf, Chana de Wolf and Mike Federowicz.“From its inception in 1964,” they write, “cryonics has been known to frequently produce intense hostility from spouses who are not cryonicists.” … Premonitions of this problem can be found in the deepest reaches of cryonicist history, starting with the prime mover. Robert Ettinger is the father of cryonics, his 1964 book, “The Prospect of Immortality,” its founding text. “This is not a hobby or conversation piece,” he wrote in 1968, adding, “it is the struggle for survival. Drive a used car if the cost of a new one interferes. Divorce your wife if she will not cooperate.”

Thankfully, Hanson and Jackson don’t seem to be heeding Ettinger’s advice. When asked to speculate why it might be that so many don’t see cryonics as a good decision, Hanson described cryonics as analogous to a “a one-way ticket to a foreign land.”

I suppose that works, but let’s flesh that analogy out a little bit more. Cryonics is like buying a ticket to a foreign land to which no one has been and may not even exist; in a vehicle that, if it stops working for just a couple of hours at any point on its indeterminately long journey, will kill (for real this time) everyone on board; all with the hopes that when you arrive the people of the foreign land will have the benevolence and the ability to not only bring you back to life, but also reverse the damage caused by rotting and freezing as well as the terminal issues that caused your death in the first place. Whew. Oh, and the ticket costs $100,000 and your current quality of life is reduced because you have to start paying for the ticket now.

You know what? I can see how that might strain my current friendships and/or sanity. You guys go on with out me. I’m going to keep holding out for Aubrey de Grey and the SENS Foundation to keep me from dying in the first place. Come ooooon, resveratrol.


Vicious Hogweed Plant Could Star in “Little Shop of Horrors” Sequel | Discoblog

hogweedIt blinds; it burns; it looks kind of pretty. An invasive, poisonous plant known as giant hogweed, or Heracleum mantegazzianum, is attacking western Ontario.

The plant is a member of the carrot or parsley family, and as described in a brochure (pdf) from the Michigan Department of Agriculture, 20th century gardeners cultivated the giant for its impressive size and for its stem’s purple coloring. But it soon broke out of gardens and arboretums, its seeds finding soil outside of captivity.

Besides Canada, the plant has also appeared in the northern United States (both east and west) and as far south as Maryland. Ontario officials are concerned with the plants’ continuing spread–it was most recently sighted in Renfrew County–and have urged anyone who spots it to contact them immediately.

hogweed-burnGiant Hogweed can grow to almost twenty feet tall and five feet wide, and each plant can produce around 500,000 seeds. Sap on your skin can give you ugly blisters, the CBC reports, and sap in your eyes could cause blindness.

Jeff Muzzi, manager of forestry services for Renfrew County, told the CBC that, despite its heft, the weed is a stealthy attacker.

“[Exposure] could be inadvertent,” Muzzi said. “You might not even know it’s here, [just] walk into it and happen to break a leaf. The next thing you know, you’ve got these nasty burns.”

Renfrew County officials are attempting to thwart the toxic plant’s leafy grip by distributing pamphlet warnings and, as the CBC reports, through “weed-whacking campaigns.”

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Discoblog: For Guilt-Free Fur, Wear a Coat Made From an Invasive Water Rat
Discoblog: Does Fighting Forest Fires Help Invasive Species?
Discoblog: Crocs Chow Down on Invasive Toads, Instantly Regret It
DISCOVER: Humans vs Animals: Our Fiercest Battles With Invasive Species (gallery)

Images: Wikimedia, Michigan Department of Agriculture


Live stream of Rosetta’s July 10 asteroid flyby | Bad Astronomy

At 15:45 UTC tomorrow, July 10, the European Space Agency probe Rosetta will fly to within 3200 km (2000 miles) of the asteroid 21 Lutetia. This close pass will reveal, for the first time, the shape and details of this roughly 100-km-diameter rock.

You can watch this event live as it happens; ESA is streaming the event. Around 01:00 UTC they’ll start presenting the images, too. Below is an embedded feed that will go live once the actual stream starts.

I’m very excited about this! This is all happening during TAM 8, but I’ll try to watch it live if I can too.


Genetic Switch Makes Female Mice Try to Mate With Other Females | 80beats

PCWmice1Geneticists have found a way to alter the sexual preference of lab mice. When they bred mice who had one gene deleted, the females declined male companions and preferred instead to court other females, according to a study published yesterday in BMC Genetics. But whether these results have any implications for humans is still far from clear.

Chankyu Park and his team at the Korea Advanced Institute of Science and Technology deleted the female’s fucose mutarotase gene and, as a result, changed the brain’s exposure to enzymes that control brain development.

The gene, fucose mutarotase (FucM), is responsible for the release of an enzyme by the same name, and seems to cause developmental changes in brain regions that control reproductive behaviors. The mice without the enzyme would refuse to let males mount them, and instead tried to copulate with other females. [AOL News]

The enzyme typically works with a protein to prevent a build-up of the hormone oestrogen in the mouse brain; extra oestrogen causes parts of female mice brains to develop like typical male mice brains. Explains Park:

“The mutant female mouse underwent a slightly altered developmental programme in the brain to resemble the male brain in terms of sexual preference.” [The Telegraph]

Park has not found a “gay gene”–it’s impossible to tell at this stage what relationship, if any, this study has with human sexual preferences. For one, the hormone that “masculinizes” human brains is testosterone rather than oestrogen, and the protein block isn’t the same either. Still, Park hopes to investigate further to see if the study will shed any light on human sexuality.

Now, Park and his colleagues are hoping to use gene screening studies to find out whether fucose mutarotase has any association with sexual orientation in humans. He admits this research may be “very difficult”, partly because it will not be easy to find a suitable number of volunteers. [New Scientist]

Related content:
80beats: A Gay Man’s Brain Looks a Lot Like a Straight Woman’s Brain
80beats: Gay Penguin Couple Adopts Chick in German Zoo
80beats: Familial Rejection of Gay Teens Can Lead to Mental Health Problems Later

Image: Wikimedia


The Stress of a Busy Environment Helps Mice Beat Back Cancer | 80beats

lab_miceA little stress can do a mouse good, a new cancer study suggests.

Matthew During wanted to see whether stressing out mice by messing with their environment would affect the rate of tumor growth. So, for a study that now appears in Cell, he and his team divided up their mice into two groups. Some mice lived quiet, peaceful lives in cages shared between five mouse roommates, while the other group lived in a stressful cluttered cacophony, where the cages held 18 to 20 animals plus numerous distractions and challenges like toys, mazes, and wheels.

Mice were then injected with tumor cells, which led to malignancies in all of the control animals within 15 days… The rate of tumor formation in animals living in the enriched environment was significantly delayed, and 15 percent had not developed tumors after nearly three weeks; when tumors were visible, they were 43 percent smaller than the lesions on control animals [Scientific American].

Because the “enriched environment” gave those mice so much more to do, an obvious conclusion would be that it’s the uptick in physical activity—not the effect of added stress—that kept tumors at bay. So During’s team tested the mice to see if just giving them more time on the running wheel, independent of the other factors, was enough to see the effect. It wasn’t.

Physical exertion alone also didn’t inspire the chemical changes that the team thinks could be responsible for the anti-cancer effects they saw.

The ‘enriched’ mice, the researchers found, had slightly raised levels of stress hormones, but the most striking physiological change was markedly reduced levels of the hormone leptin, known to regulate appetite. Blocking leptin abolished the effects of enrichment, suggesting that the hormone was key to the pathway that led to the anti-cancer effects [Nature].

The linchpin behind all this seems to be a protein called brain-derived neurotrophic factor (BDNF), which increased in the enriched-environment mice. Further tests by the team suggested that the protein spurred the drop in leptin and boosted the immune system, which would be connected to the tumor reduction.

That’s fine for mice, but what about us?

Whereas most people live in fairly safe environments, with plenty of food and some degree of social interaction, “our data suggests that we shouldn’t just be avoiding stress, we should be living more socially and physically challenging lives,” During says [Scientific American].

Related Content:
80beats: Study: Lonely Rats More Apt To Get Deadly Cancer
80beats: In Mice, Breast Cancer “Vaccine” Trains the Body to Fight Cancerous Cells
80beats: Researchers Find the Genetic Fingerprint of Cancer, One Fingerprint at a Time
80beats: Scientists’ Mouse Fight Club Demonstrates Home Field Advantage

Image: Wikimedia Commons


What Really Killed The Mammoth?

Has anybody thought that the end of the mammoths and other large mammals like the saber-toothed tiger looks a lot like the demise of the dinosaurs?  Mass extinction events are one of my personal interests, especially when they involve a celestial body or event.  We have a lot of evidence to support an impact event as a contributing factor to the end of the dinosaurs, but what about the large mammals about 12,000 years ago?

Smilodon, the Saber-Tooth Cat - Image by Wiki user Wallace63- on display at the American Natural History, New York - all rights reserved

Now, guess what:  You are not going to believe this, but scientists working in Antarctica have found a LARGE distribution of hexagonal nanodiamonds at the level about 12,000 years ago.  We only get hexagonal nanodiamonds in an impact event, they aren’t formed naturally on Earth.  They’re called “presolar grains”, and they’re probably formed in the supernova of red giants, like Betelgeuse.

No crater has been found to correspond with the findings in Antarctica, but the geological record shows a “black mat” (containing Iridium) at the level of about 12,000 years ago, so it looks like something happened.

Dodo Bird - remake of a 1626 painting by Roelant Savery - copyright expired

There have been many mass extinctions in Earth’s history.  Over 98% of all the species ever living have gone extinct.  We’re in the middle of an extinction event right now, the Holocene extinction (possibly having it’s origins 12,000 years ago).  From 1500 to 2009, we’ve documented the loss of 875 species.  Since extinctions often go unnoticed, some scientists think that we may have lost up to 2 million species.  The Species-area theory puts the loss at 140,000 species annually.  The UN Convention on Biological Diversity estimates that species are being lost faster than they are discovered… at the rate of three per hour.  Yes.  Three per hour, the worst extinction in millions of years.

Impact nanodiamond - STEM image - image by Wiki User "NIMSoffice" - all rights reserved

Now that I have your attention, the Younger Dryas event postulates that we had an air-burst comet over the North America Great Lakes Area ca 12,900 BP  (“BP” just means “before present”), much like the Tunguska Event.  A Paleo-Indian culture called the Clovis Culture was also lost during this event.  The Clovis Culture has long been blamed for the loss of the mammoth due to over-hunting; a good hypothesis, considering we of European descent almost wiped out the buffalo due to stupidity and greed… but look at Indigenous people in recorded history.  They don’t usually over-hunt like that… they have more respect for their environment.

Wooly Mammoth - by Benjamin Waterhouse Hawkins - copyright expired

Scientist are taking closer looks at past extinction events, and it looks like a celestial event may be a contributing factor in more of them than previously thought.  What’s exciting is the ice record in Antarctica.  It’s a frozen record of what the environment was like thousands of years ago, and as we get better at understanding the record, we learn more about the past.

What do you think about it?  I’d be very interested in hearing your considered opinion.

Garage Alchemy Is Not for the Weak of Stomach | Visual Science

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If you have any questions or feedback, please email webmaster@discovermagazine.com. Thank you for reading Discover, and we apologize for the inconvenience.

<p>A modern retort purchased from a chemical apparatus supplier in India. Retorts are no longer commonly used in the United States.</p><p> </p><p>Another retort from an Indian chemical apparatus supplier.</p><p> </p>

Would You Trust Your Life to a Vest Made With Bullet-Proof “Custard”? | Discoblog

kevlarwebFacing enemy gunshots, which would you choose: the old stand-by Kevlar vest, or a new “liquid” suit? Ongoing research at BAE Systems suggests you might be wise to pick the latter. Recent tests, BAE researchers suggest, hint that a combination of liquid and Kevlar layers might stop bullets more quickly and keep them from going as deep.

BAE tested each material’s mettle by blasting them will ball bearings fired at over 600 miles per hour from a gas gun. The video, available on the BBC site, shows a side-by-side comparison of 31 layers of Kevlar and 10 layers of Kevlar combined with the liquid.

Apparently, the liquid has a secret recipe for how it sticks together to absorb the bullet’s force. Watching the video, it seems like non-Newtonian fluids are at work (everyday examples of non-Newtonians include ketchup and peanut-butter). Though a cornstarch and water mixture stiffens when you punch it, it’s hard to see cornstarch making strides on the battlefield.

Even if he can’t divulge the details, Stewart Penny, a business development manager at BAE, told the BBC that the material is seriously sticky.

“It’s very similar to custard in the sense that the molecules lock together when it’s struck.”

BAE also believes that the new liquid suit will be less cumbersome than traditional Kevlar suits–reducing soldiers’ fatigue and also, given that it’s liquid, improving their flexibility in the field.

Related content:
Discoblog: A Life-Saving Slime? Military Has Eyes On Bullet-Proof Gel
Discoblog: How to Make a Bulletproof T-Shirt
Discoblog: Are Bulletproof Turbans the Next Safety Gear for Sikh Policemen?
Discoblog: NCBI ROFL: Best materials and methods ever.

Image: flickr/ The Ratt


Sock Puppets and “Tom Johnson,” Part II | The Intersection

Okay, so here is the second post. Preface: It seems a lot of people are confused (and rightly so) about whether "Tom Johnson" is or isn't who I thought he was after checking his identity. This may be in part because my alarmed and shocked post on Wednesday was less than perfectly clear. However, at the same time, there has been much leaping to conclusions about what happened here, and much assuming of the worst. Well, much--although not all--will be revealed....
* * * * * * "Tom Johnson." Back in October, "Tom Johnson" posted a personal story on this blog as a comment. And then I did something that, if I'd known one tenth of what I know now, I would not have done: I gave it some added attention. More specifically, I elevated the comment into an individual post and later thanked "Tom" for sharing it. I had no problem doing this at the time. It was just a blog post, and I had no reason to think there was anything fishy going on. And I did note that the story was "one individual’s experience and point of view, and nothing more." Granted, "Johnson" was on my side of the so-called New Atheist/accommodationist issue. However, after some questioned his ...


China Renews Google’s License; Have the Two Reached a Truce? | 80beats

googlechinaIt appears Google and China have reached a détente.

The world’s largest search engine and the world’s most populous country traded barbs and threats this spring when Google said it might leave the country over the Chinese government’s Internet censorship. That fight cooled to a simmer over the last few months. Today, Google announced on its official blog that China has renewed its content provider license, further defusing the tension between the two.

Google has been waiting to hear back from Chinese authorities about its ICP license since the company filed for its renewal last week. The company’s license must be reviewed annually. Its renewal will allow the search giant to continue operating its China-based site, Google.cn. If Google had been unable to renew its license, it could have meant the end of the company’s operations in China [PC World].

To reach this uneasy truce with China, Google had to back down from the principled anti-censorship stand it took in March, when it began automatically redirecting Google.cn users to the company’s unfiltered Hong Kong-based site. Now, if you visit Google.cn, you should see a link to the Hong Kong site, but visitors won’t be automatically redirected.

“Basically, this was a smart move on the part of the Chinese government to kind of defuse the situation so that the Google search engine will still be available in China,” said Paul Denlinger, an Internet consultant for startups. He said that the friction between Google and China won’t disappear but will temporarily dissipate [AP].

Google is presently the second most popular search engine in the country, behind Chinese competitor Baidu.

Related Content:
80beats: Google Defies China’s Censorship Rules; China Quickly Strikes Back
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DISCOVER: Big Picture: 5 Reasons Science [Hearts] Google

Image: Flickr/ pamhule


The world is subtle… and that’s why it’s beautiful | Bad Astronomy

Any time I post my political thoughts on this blog, inevitably someone in the comments or on Twitter will accuse me of being a far-left nut. I typically ignore people like that, because it’s clear to me that they are not capable of understanding what I’ve actually written, and in their mind, and in these hyperpartisan times, anyone who isn’t a far-right neocon must perforce be some sort of commie or socialist.

In reality, my own thinking on political and social issues is more subtle. I am in many ways an individual libertarian (I think people should have far more personal freedom than they do in this country), a social liberal (I think one of the many roles of government is to help those who cannot help themselves, and to do what individuals and corporations cannot do or cannot be trusted to do), and a governmental conservative (in the actual sense of the old party; I want a government that is big enough to do what it needs to do and no bigger).

I also understand that ideas sometimes have boundaries in practice.

Freedoms are tricky things. Just because you can do something doesn’t mean you should. The old adage saying "Your right to swing your fist ends at my nose" is wrong and dumb; in fact the act of swinging your fist at all is a threat.

I want a government that’ll help when it’s needed, but won’t when it’s not, because I know that a lot of people will take advantage of a government that is set up to help them.

I know our economy should have the freedom it needs to grow. But I also know it needs to be regulated because people are greedy, and people with nearly unlimited power and resources will sometimes spectacularly abuse them to the detriment of the country and the planet.

I loathe the idea of killing, but I know that there are bad guys out there, and we need a strong military to keep them at bay.

I hate paying taxes. But I love our highway system, clean water, and space exploration.

I think that people have the right to defend themselves, their family, their property… and that’s why they have the right to bear arms. But I also know that many people aren’t wise enough and emotionally stable enough to own a gun, and that’s why I don’t think everyone has the right to bear every arm.

I think that everyone has the right to speak their mind. But I think many loud voices right now belong to hateful, mean, bigoted, small-minded hypocrites who will say anything to get themselves noticed or to push their agenda. I also know they all have the right, the freedom to say the terrible things they do. But I have the right, and we have the duty, to counter their speech with my own voice.

So what do we do?

We need to teach people to think. To understand that there are balances in life, nuances, corollaries to decisions.

When I watch TV news, read political opinions online, and listen to our politicians, what I hear are low resolution ideas, chunky things that this way or that way, no in-between, with big thick impenetrable borders around each part.

But when I look around I see things being rich, diverse, subtle, poetic, minuscule, vast. I don’t subscribe to any particular ism, but look over the issues as they come, dig into my personal values and unholster my critical thinking, and come to each conclusion one at a time — though based on previous experience. Conclusions are not independent of one another.

The world I see is gloriously complex. It’s layered, with subtleties interacting with other subtleties, forcing decisions to be more difficult for me to make but more important once made, making the path more treacherous for me to walk but more satisfying to me once the journey is underway, making the view more of a struggle for me to understand but more awe-inspiring and world-changing once I do understand it.

The world I see is not black and white. No amount of shouting, no amount of name-calling, no amount of insults, no amount of spin, lies, distortion, sniping, negativity, or propaganda will change that.

Here’s how they see things:

ic342_bw

Here’s how things really are:

ic342_color

The decision is yours. Which world do you want to live in?

Image credit: T.A. Rector/University of Alaska Anchorage, H. Schweiker/WIYN and NOAO/AURA/NSF


Friendly bacteria protect flies from sterilising worms | Not Exactly Rocket Science

Drosophila

Animals must wage a never-ending war against parasites, constantly evolving new ways of resisting these threats. Resistance comes in many forms, including genes that allow their owners to shrug off infections. But one species of fly has developed a far more radical solution – it has formed a partnership with a bacterium that lives in its body and defends it against a parasitic worm. So successful is this microscopic bodyguard that it’s spreading like wildfire across America’s besieged flies.

The fly Drosophila neotestacea is plagued by a nematode worm called Howardula. Around a quarter of adults are infected and they don’t fare well. The worm produces thousands of young in the body of its hapless host, and the little worms make their way into the outside world via the fly’s ovaries. Not only does this severely slash the fly’s lifespan, it also always sterilises her. But according to John Jaenike from the University of Rochester, the fly is fighting back.

In the lab, he showed that worm-infected flies retained their fertility if they were also infected with a bacterium called Spiroplasma (below). The same was true in the wild – females carrying the bacteria and the worm were more than 10 times more fertile than those that just bore the worm. In some way, Spiroplasma hampers the growth of Howardula, halving the size of female worms who shared a fly with them.

Spiroplasma

Spiroplasma itself commonly infects insects and this is the first time it has been cast in the role of protector. In some cases, it can be a trouble-maker. Because it is passed down from mother to daughter, it sometimes kills the males of the species it inhabits, skewing the sexes in a population-threatening way. If it’s doing the same in the fly, it’s clear that the benefits it provides are outweighing these drawbacks, for the bacterium is clearly spreading throughout the American population.

Jaenike couldn’t find any traces of Spiroplasma in specimens of D.neotestacea that were collected in the 1980s and stores in museums. Among these museum specimens, virtually all of those that also harboured Howardula worms were clearly sterile, so back then, the fly hadn’t found a way to resist the worm. In the eastern states, it’s clear that Spiroplasma went from infecting less than 15% of flies in the 1980s to around 80% in some states today.

This now-beneficial bacterium is on the march. While it’s very common in the east, it’s virtually absent in the west even though Howardula infects flies at similar rates throughout all of North America. As females carrying the protective Spiroplasma give birth to similarly infected daughters, so the range of the bacterium slowly creeps westwards. And all of this was done in 2008. By now, Spiroplasma may well have made its west coast breakthrough.

Spiroplasma seems to have been a long-term partner for the fly, long before it became more common and long before Howardula came onto the scene. There are a couple different strains of the bacterium but both of them provide resistance against the worm, which suggests that Spiroplasma itself hasn’t adapted to the rising threat of Howardula. It seems the spread of Spiroplasma has been fuelled by the recent rise of Howardula in North America. That imposed a strong evolutionary pressure upon the flies to evolve some sort of defence, and they ended up doing so by increasing the frequency of their defensive bacterium at a breakneck pace.

For now, it’s not clear what the partnership between fly and bacterium was like before this point. However, it seems that D.neotestacea has responded to the emerging threat of a parasitic worm by shifting to a bacterial defence, using a hitchhiker that had been living in its bodies for many years previously.

Reference: Science http://dx.doi.org/10.1126/science.1188235

More handy bacteria:

To catch a predator: familial DNA | Gene Expression

I already blogged this general issue, but the ‘grim sleeper’ murderer was caught because of a match of old samples with those of us his son. If I had to bet money I think this sort of result (California and Colorado are the two American states which have a system in place to allow for this) is going to allow for a push toward more widespread usage of the technique. It may be that we need to stop talking about privacy as if we can put off the inevitable future, and start talking about accuracy and precision with the data that is going to be easily available to authorities. By the way, I found this objection somewhat strange:

“I can imagine lots of African-American families would think it is not fair to put a disproportionate number of black families under permanent genetic surveillance,” said Jeffrey Rosen, a law professor at George Washington University who has written about this issue.

A disproportionate number of black families have relatives incarcerated. The American public does not seem particular worried about that. As I noted before, criminal behavior is not randomly distributed across families. Rather, there are distinct clusters, so familial genetic data is going to be more efficacious than you would expect if the commission of crime consisted of a sequence of independent events.

I have to add that worries about this technology strike me as a bit rich, in light of the fact that methods which are proven to be highly subjective and often inaccurate, such as fingerprinting and eyewitness identification, are accepted in the criminal justice system. I worry about what the state could do with DNA data if the state became malevolent, but despite its flaws it seems to me far preferable as a means of assessing evidence than some of the “tried & true” techniques. So let’s keep some perspective.

New Horizons Course Correction

Position of New Horizons on the date and time indicated. Credit: New Horizons website.

The New Horizons spacecraft is well on its way to “it’s not a planet”, Pluto.  The spacecraft is about half way there, so far the flight time has been 1629 days (depending on when you read this) with about 1739 left to go before operations begin.

It turns out a course correction was needed if the planned arrival 7,767 miles above Pluto at 07:49 am July 14, 2015 was going to happen as planned.

The course correction involved sending commands to traverse the more than 1.49 billion miles to the spacecraft – yeah 1.49 billion miles, it takes about 2.25 hours for the radio signals to make the trip one way traveling at the speed of light.  The commands were instructions for a 35.6 second thruster firing that increased the speed of New Horizons by just 1-mph.  The reason for the increase in speed is completely amazing:  it seems a tiny amount of force is created by thermal photons from the radioisotope thermoelectric generator power source, get this, reflecting off the backside of the spacecraft’s high-gain antenna and this force needs to be counter acted.  Pretty cool eh?

The commands were sent and the burn accomplished. . . onward to Pluto we go.

Visit the New Horizons website to learn more about the mission including the current position.

Acidic Oceans May Cause Clownfish to Swim Straight to Their Doom | 80beats

clownfishSure, the planet’s increasing carbon dioxide levels are making the oceans more acidic, but what does that really mean for sea life? We’ve already heard that the ocean’s changing chemistry is damaging corals and interfering with mussels, but that’s just the beginning. It turns out things could get seriously weird.

In a paper published this week in The Proceedings of the National Academy of Sciences, researchers led by Philip L. Munday of James Cook University have given us a concrete example: the increased CO2-levels make some fish purposely swim towards predators.

As part of his experiment, Munday used a Y-shaped maze to force baby clownfish to choose between two paths. One path reeked of rock cod, a natural predator; the other had no danger scents. Munday’s team compared the choices of fish raised in water of varying carbon dioxide concentrations, from today’s levels of 390 parts per million up to future expected levels of 850 ppm.

Those clownfish raised in today’s CO2 concentrations behaved as you might expect: ninety percent of the time, they avoided the rock cod stink and, after little more than a week of training, they always chose the safe path. But at 700 ppm, something alarming happened. The fish headed straight for the predator’s smell 74 to 88 percent of the time. At 850 ppm, after about eight days, every single fish chose the path to death.

The scientists speculate that the acidic waters damage the fishes’ sense of smell, which along with avoiding predators, they must use to find family and home:

“They can’t distinguish between their own parents and other fish, and they become attracted to substances they previously avoided. It means the larvae will have less opportunity to find the right habitat, which could be devastating for their populations,” said Kjell Døving, a co-author from the University of Oslo. [Guardian]

For all the details, check out Ed Yong’s post in Not Exactly Rocket Science.

Related content:
80beats: No More Speculation: Scientists Prove Ocean Acidification is Already Underway
80beats: Ocean Acidification: Worse Than the Big Problem We Thought It Was
80beats: Ocean Acidification Could Leave Clown Fish (Like Nemo) Lost at Sea
80beats: A Glimpse Into a Future With Acidic Oceans
80beats: In a More Acidic Ocean, Coral Reef “Skeletons” May Crumble

Image: flickr / Sean McGrath


Scientists’ Mouse Fight Club Demonstrates the Home Field Advantage | 80beats

lab_miceIt feels good to win. And it feels even better to win at home.

For a new study in the Proceedings of the National Academy of Sciences, Matthew Fuxjager and his colleagues investigated the winner effect, wherein animals (and perhaps humans) build up testosterone in advance of a confrontation, and the fight’s winner maintains that elevated level. By studying male mice fighting one another, Fuxjager was able to see what happens in the brains of winners. Not only did victorious mice experience the “winner effect,” but those who won at home—in their own cages—saw the most activity, and wanted to keep on fighting.

To get these results, Fuxjager’s team essentially created a tournament of mouse fights.

One challenge they faced was ensuring the right mice won the right fights. They got around this by borrowing a trick from seedy boxing promoters the world over, pairing the favored mouse with a weaker, less sexually experienced opponent who could not hope to spring an upset. Once a mouse had notched three consecutive victories, they studied its brains for any chemical changes [io9].

In the brains of winning mice, they saw an uptick in the hormonal expression in regions that govern aggression. And in the brains of mice who won at “home,” they saw something else.

In addition, “home-win” mice showed increased androgen sensitivity in regions that mediate motivation and reward. These mice also won more subsequent fights compared to mice who’d only come out in away fights [New Scientist].

While the winner effect might help mice defend their territory in the wild, it’s not always good—especially when it comes to humans. When DISCOVER spoke to John Coates about the neuroscience of the financial collapse, he suggested that the effect could have something to do with the high-risk behavior of Wall Street traders. Once testosterone levels reach the point where performance peaks, any continued increase starts to override our judgment—and those sub-prime mortgage bundles begin to look more and more tempting.

Related Content:
DISCOVER: Could “Hormonal Diversity” Help Prevent Another Meltdown?
80beats: Does Testosterone Make Trusting Women More Skeptical?
80beats: Does Testosterone Cause Greedy Behavior? Or Do We Just Think It Does?
Not Exactly Rocket Science: Testosterone-Fueled Traders Make Higher Profits

Image: Wikimedia Commons


Cectic does pareidolia | Bad Astronomy

Funny, that seems like an obscure title, but in fact it’s accurate. Cectic is a skeptical web comic. Pareidolia is the human predilection to see faces in random patterns. Recently, Cectic did a comic on pareidolia:

cectic_pareidolia

Click it to see the rest (somewhat marginally NSFW and bound to offend some folks). It’s a pretty handy checklist, in fact, for those disposed to thinking that the face they see is anything more than a stain, wood grain, or hair pattern.


Diplomacy among the aliens | Gene Expression

brotherhoodOne of the structural difficulties with any systematic study of civilizations is that the sample size of the category is rather small, as is clear in the few attempts to examine their progression (see Arnold Toynbee). Additionally, there’s always the problem with how one generates a typology for something as fluid as civilization. Where does antiquity end, and the medieval period begin? One can get a rough sense of the discontinuities impressionistically. Consider the appearance of the Column of Phocas, erected in 608 AD. It may be correct that chronologically the Byzantine state and society on the eve of the expansion of Islam in the early 7th century was closer to the era of Charlemagne than Constantine, but many would argue that it was basically a Late Antique society more than an Early Medieval one. Certainly the Byzantines of that age would have agreed with that assessment (though one has to be careful about taking people at their word, the last Byzantines before the Ottoman conquest in 1453 famously still referred to themselves as Romans).

But such typologies remain a matter of art, and are subject to great dispute. Any inferences one generates or generalities one perceives will be subject to the reality that the individuals engaging in the act have a strong impact on the size and distribution of the sample (this is obviously true in ecology or empirical social sciences, but the methods here are generally more explicit and easy to critique). With all that said I think at the boundary condition we can agree upon some civilizational distinctions if such typologies have any meaning or utility. The world of the ancient Near East was on a deep level culturally alien to our own, and the period between 1200 and 800 spans a extremely sharp rupture between what came before, and what came after.


448px-Mesopotamia_male_worshiper_2750-2600_B.CIts alien aspect is one reason that I am fascinated by the ancient Near East. Egypt as a civilization and society exhibited intelligible continuity within itself for nearly 2,000 years between the Old Kingdom and the first centuries of the first millennium before Christ, up to the conquest by the Assyrians (I suspect intelligible continuity precedes the Old Kingdom, but written sources become rather sparse before that). Obviously aspects of ancient Egypt persisted for centuries after its operational demise, as made clear by artifacts such as the Rosetta Stone which date to the kingdom of the Ptolemies. The pagan Egyptian temple of Philae was active down to the 6th century A.D., but with its closing by Justinian the last deep cultural connection to the world of the Pharaohs was lost (the Coptic language is derived from ancient Egyptian, but the Copts were unable to tell Europeans how to read the hieroglyphs because they did not know). The world of the ancient Fertile Crescent is in many ways even more distant in memory from ours than that of Egypt. Egypt in its declining phase was a stronger active influence on the Greeks. Rather, it is through the Hebrew Bible that we can glean fragments of the shape of the ancient Bronze Age societies of Mesopotamia and Syria, in particular in Genesis. And just as a shadow of Egypt persisted down to the Roman conquest and beyond, so the civilization of Babylon and Assyria was absorbed in part by their Persian conquerors. But note that the Epic of Gilgamesh, which has within it a variant of the famous Biblical flood story, was not rediscovered until the 19th century, despite its enduring fame over the 2,000 years of Mesopotamian civilization between Sumer and the Neo-Assyrian Empire. Without the translation efforts of modern archaeologists and philologists Mesopotamian culture would be an empire of artifacts, rather one which illuminates our minds with the imaginings of the past.

Knossos_fresco_womenThe ancient Near Eastern cultural complex extended beyond Egypt and the Fertile Crescent. It encompassed Anatolia, and even the Aegean, into what we today call Greece. But I contend that despite the differences of language a modern person might have more in common with a citizen of 4th century Athens, than a citizen of 4th century Athens would have with a subject of the wanax of 12th century Athens. Some of this is a function of the reality that the modern mentality is to a large extent an outgrowth of that of the Ionian Greeks and their intellectuals heirs. Similarly, the Chinese civilization also took its present shape during this period. Hindu civilization in a non-mythic dimension goes back no further than the first millennium. In the Greek and Indian cases there is a great deal of archaeological evidence for complex literate societies during the Bronze Age. In the Aegean case the script of the last of the successive societies, the Mycenaean, has been deciphered. They spoke Greek and worshiped the same gods as the Classical Greeks. Much of the background material in the Iliad and the Odyssey clearly references the Mycenaean period (though the narrative core is perhaps reflective of the Dark Ages before the rise of Classical Greece). But Classical Greece was built anew, on a different cultural foundation from that the Mycenaeans. The kings of Bronze Age Greece were part of the “brotherhood of kings.” The city-states of Classical Greece were distinct from the despotisms of Asia. The Classical Greeks had forgotten their history aside from legends. The Bronze Age walls of cities such as Tyrins were presumed to have been constructed by giants (“cyclopean”)!

I have alluded to the fact that the enormous proportion of ancient Classical works we have today can be attributed to intense phases of translation and transcription during the Carolingian Renaissance, the Abbassid House of Wisdom, and the efforts of Byzantine men of letters such as Constantine Porphyrogennetos. The reason for these efforts was that in part these ancient literary works were the products of natural predecessor civilizations, to whom the medieval West, Byzantium, and Islam, owed a great deal. The memory of Plato and Aristotle, Caesar and Darius, persisted down to their day. The classical education of early modern Europeans built upon the toil of the medieval period. The Renaissance would not have been able to revive anything if no works of the ancients were copied down and transmitted down to future generations.

In sharp contrast the details of our knowledge of the Bronze Age world are due to the work of modern archaeologists and philologists. Aside from a few references in the Bible to an offshoot kingdom, the Hittite Empire had been totally forgotten! Dead cuneiform, once deciphered, brought back a world which had lain dormant for thousands of years. There are many elements of these lost civilizations which we comprehend only in spare fragments. For example in the fourth millennium BC it seems from the archaeological record that Mesopotamian merchants had colonies which replicated their culture in toto in Anatolia, while Mesopotamian influences through diffusion are indisputable in pre-Dynastic Egypt. In the 3rd millennium this cultural hegemony waned, and Egypt seems to have sealed itself off from outside influence until the 2nd millennium, while the Mesopotamian stamp on Anatolian society diminishes. But without full-blown writing we can only conjecture as to the dynamics of this period of the expansion of Mesopotamian civilization. By the time the light of text illuminates the world Mesopotamian culture had retreated in its complete form to Sumer and Akkad.

But there is still much we know now. The robusticity of baked cuneiform means that the destruction of ancient palace complexes is a boon to modern archaeologists and historians. Though Egyptians used papyrus, they also stamped their monuments with hieroglyphs, and critically the correspondence with foreign nations was generally done in Akkadian cuneiform. This last is critical for the narrative in Brotherhood of Kings: How International Relations Shaped the Ancient Near East. From the introduction:

The diplomatic system developed in the ancient Near East was forgotten for millennia; there’s no collection of marble busts of ancient kings in the entrance hall to the United Nations in honor of their contribution to the history of humanking, no requirement that children study the ancient peace treaties as founding documents, the way they might study the Magna Carta or the United States Constitution. There’s a good reason for this: We can find no direct link between the ancient practice of diplomacy and that used today.

But it is edifying, even inspiring, to know that right from the earliest centuries of civilization, ancient kings and statesmen of distinct and different lands were oftne willing, even eager, to find alternatives to war and see one another as brothers rather than enemies.

Economists might term this a separate “natural experiment,” distinct from the Westphalian model. More colloquially one might consider the Near Eastern diplomatic system as a “first draft.” Because of the sharp differences between that world, and our epoch, similarities are particularly telling as to the deep cognitive biases which drive our cultural forms. In Brotherhood of Kings the author traces the evolution of the art of ancient diplomacy from the cities of third millennium Mesopotamia and Syria, down to the climax of the tradition during period of the Amarna letters, in the 14th century BC.

First, kinship matters. This is almost a trivial assertion, but the ubiquity of kin terminology in political orders despite the lack of blood ties reinforces the importance of abstracting the genealogical relationship to a grander scale. The Chinese Emperor was the Son of Heaven, and the father to his people. Similarly, the President of the United States of America was the “Great White Father” to Native tribes in the 19th century. Sometimes the kinship was not fictive, but literal. In the 19th century continental Europe was generally at peace, at least in relation to previous eras. Some attribute this to the fact that European states were generally monarchies, and the monarchs were all members of an extended family. Similarly, by the 14th century relations between Egypt, Mitanni (Syria and northern Mesopotamia) and Babylonia were generally peaceful, and cemented by exchanges of royal women as brides in the polygynous households of the monarchs. The existence of a Minoan palace in northern Egypt is evidence in the author’s eye to princesses from the island of Crete in the household of the Pharaoh. A wedding was a marker of a cultural exchange.

Sometimes the analogies to later epochs are striking. After the famous king Tutankhamen died, his young wife wrote a letter to the king of the Hittites:

“My husband has died and I have no son. They say about you that you have many sons. You might give me one of your sons to become my husband. I would not wish to take one of my subjects as a husband… I am afraid.”

The king, a powerful warlord by the name of Suppiluliuma, eventually sent his son Zannanza, who seems to have died. There is a strong suspicion by the nature of Suppiluliuma’s angry subsequent correspondence that foul play was involved, and that Zannanza was undone by a reaction in the court of Egypt to the arrival of a foreign prince. The outcome of this personal and political tragedy was war, as Suppiluliuma used this event as a casus belli for an invasion which rolled back Egypt’s dominion in the Levant and expanded the Hittite Empire. The connection between the personal and political, and the necessity for noble women to seek outside aid, reminds me greatly of the period before the Gothic Wars, with Tutankhamen’s wife being in a similar position as Amalasuntha.

But this episode was peculiar in another way: the Pharaohs of Egypt never gave their daughters out to foreign powers, rather, they received the daughters of the other kings. This is explained in Brotherhood of Kings in two ways. The more prosaic one is that while the non-Egyptian kings generally viewed the potentate receiving the daughter as inferior, because now he would be the son-in-law (extending the kinship analogy), the Pharaohs perceived that they were superior because they were receiving gifts from non-Egyptian kings. This is a classic “win-win” scenario. Even if the monarchs in question understood the cultural disjunction, these movement of women from the Fertile Crescent to Egypt was in part motivated by signalling status to their own circle of nobles, who may not have been as conscious of these cross-cultural distinctions.

More importantly I suspect, Egypt was richer and more powerful than any of the other kingdoms during this period. It is indicative to me that the instance where the Egyptian widow seeks a foreign prince it is from the Hittites, as this nation was waxing, and was arguably as resource rich as Egypt in many ways, not to mention militarily successful. The correspondence in the Egyptian archives show that the kings of Mitanni and Babylonia persistently bleat for gold, gold, gold. Egypt was rich in gold, and they were not. These kings frankly state that so long as they receive gold they will return to Egypt whatever the Pharaoh would like to maintain the balance of payments. The supply of gold was inelastic to the demand because of its scarcity. In contrast the monarchs of Mitanni or Babylonia could increase the production or procurement of textiles and other fine manufactures and imports. One of the most bizarre facts about the reign of Akhenaten is that he apparently promised the king of the Mitanni a set of gold statues, which he never delivered. Nearly every piece of correspondence from the Mitanni king during Akhenaten’s two decades of power includes a reference to the missing gold statues!

It seems clear that one of the goals of the ancient diplomatic system was to substitute gift giving for war. Plunder and piracy were a major revenue source for elites, especially in an age where commerce and trade did not exhibit the efficiencies we take for granted later (recall that there was no standard coinage). But this was risky, and entailed expending resources and time. Part of the rationale for conquest was clearly to secure resources which were scarce or nonexistent in one’s own domains. The giving of gifts between monarchs, whether equals (”Great Kings”) or between a hegemon and his vassals, was a way in which scarce goods could flow between territories. If gold and other luxury goods were to travel between states there would obviously be a necessary premium on security. Certain fixed costs would be entailed, and one would probably want a reasonable economy of scale to maximize efficiency. The despots of this ancient world were in the best position to provide these services. The luxury goods would eventually “trickle down” to the sub-elites after the initial exchange in subsequent gift giving.

But these abstractions, the aggregate flow of goods and services (in the latter case, specialists such as doctors and diviners), had to be made concrete in the concepts that these people understood. Contracts and treaties were witnessed by the gods, and the gods served as guarantors of the fidelity of the parties involved to their oaths. Oath-breaking was serious enough that Suppiluliuma’s own son attributed some of his father’s misfortunes to oath-breaking early in his tenure during his usurpation of the throne. These gods were classical polytheistic entities, but the various nations operated in the same supernatural framework, as these were henotheistic societies. Religious concepts had not become so elaborated or philosophical that the oaths would have encountered difficulty because of incommensurability of terminology. And these contracts and treaties were made between fictive, and sometimes real, kin. On occasion the blood ties mattered, as when an Assyrian monarch intervened to kill the usurper who had killed his own grandson, the king of Babylon. Just as these blood bonds could motivate violence and intervention, so no doubt they engendered more amity than would otherwise have been the case. The royal women who moved between capitals served as the critical glue, and it seems that they brought entourages on the order of hundreds. Young princes of mixed parentage would then have grown up in a relatively cosmopolitan world, and been less conditioned to view outsiders as aliens.

488px-Map_of_fertile_cresentSo there is much that is familiar in this ancient world, even down to a transnational elite which may share more in common in values and culture with each other than with the populations which they rule. But there are differences. I alluded above to an analogy with 19th century Europe. Despite the differences in national history and religion, the Christian kings of Europe in the wake of the Napoleonic Wars forged a common sense of purpose and mutual understanding. This was made concrete by an acceleration of the pattern of intermarriage, or the placement of branches of the European ruling caste as heads of state of new nations (e.g., Greece). This stability was shattered with the maturity of mass populist nationalism in the 19th century, and basically killed during World War I. But it was constrained to Europe and European descended societies. The Ottoman state and the Empire of Japan were on the fringes, in large part because of deep civilizational differences. In enlightened circles works such as Clash of Civilizations are in bad odor. Though most would balk at accepting an argument with the punch of Francis Fukuyama’s The End of History and the Last Man, a milder variant was common in the 1990s.

As we enter the teens of the 21st century I think the idea of a world civilization, with a common cultural currency which might serve as a means of exchange for deep diplomatic understandings, is fading somewhat. The world of the ancient Near East did not include Shang China, and during its more antique phase it did not include the society of the Indus Valley (which was integrated in terms of trade and commerce, but not politics, with Mesopotamia). It was a small world where ties bound through fictive kinship made sense, as kinship terms in their atoms are human universals. The rhetoric of universal brotherhood persists down to this day, glossed up with a scientific patina through reflexive references to Lewontin’s Fallacy. But the rise of China and Russia should give us pause in assuming a deep common cultural foundation which can serve as a universal glue. Russia is a petro-state in demographic decline, so it is less interesting. Rather, China is reasserting its traditional position as the preeminent civilization in the world, and it is doing so without being Westernized in a way we would recognize. The political liberalization of the world’s most dynamic capitalist Communist state is always over the horizon. Just as the roots of the modern West go back to the eastern Mediterranean in the early first millennium BC, so China’s cultural roots extend back to the same period. China is obviously a synthesis of its own indigenous traditions, and modern Western culture, in particular science & technology. But I am not convinced that there is a true “brotherhood” between the president of China, and Western powers, and that is not a cheery prospect.

Image Credit: Wikimedia

Losing Nemo 2 – clownfish swim towards predators as CO2 levels rise | Not Exactly Rocket Science

Clownfish_portrait
If you think the stars of Pixar’s Finding Nemo had it rough, spare a thought for the plight of real clownfish. These popular fish may struggle to survive in oceans that are becoming enriched with carbon dioxide. High levels of CO2 dissolved in the water can muddle a clownfish’s sense of smell, preventing it from detecting both shelter and threats.

Philip Munday from James Cook University has shown that at levels of carbon dioxide within what’s predicted for the end of the century, a clownfish’s ability to sense predators is completely shot. Some larvae become literally attracted to the smell of danger and start showing risky behaviour. It’s not surprise that they die 5-9 times more frequently at the mouths of predators.

The conditions that Munday simulated in his experiment aren’t too far away. Thanks to the carbon dioxide that human activities produce, carbon dioxide levels in the atmosphere are predicted to reach 500 parts per million (ppm) by the middle of this century, and between 730-1020 by its end. Much of this gas dissolves in the oceans, making them more acidic. In the past two centuries, the pH value of the world’s oceans has fallen 100 times faster than any time in the past 650,000 years.

The actual fall in pH values seems quite small – just 0.3-0.4 units, barely visible on a litmus test. But this tiny difference can have a big impact on marine life. It depletes the water of ions that corals and shellfish need to build their shells and reefs. But Munday has shown that fish suffer too. Last year, he showed that when carbon dioxide levels in the water go up, baby clownfish lose their ability to find their way home. Contrary to Finding Nemo, young reef fish grow up in the open ocean, far away from their birthplace. They rely on their sense of smell to swim home, but with that sense baffled by CO2, they could end up anywhere.

Now, Munday has shown that even if they pass this trial, they still face a higher risk of blindly stumbling into a predator. He reared orange clownfish in water with carbon dioxide at 390 ppm (today’s level) or 550, 700 and 850 ppm (predicted levels in the future). He placed the babies in a straight arm of a Y-shaped tube, with the smell of a predator (a rock cod) wafting down one arm, and the smell of fresh danger-free water coming down the other.

In today’s water, clownfish larvae strongly avoided the smell of the predator. They swam down the dangerous fork just 10% of the time early on in life, and avoiding it completely after 8 days. At 550 ppm of carbon dioxide, they responded in the same way. But at 700 ppm, only half of the larvae stuck to their cautious streak. The others developed a fatal attraction for the predator’s scent, pursuing it around 74-88% of the time. At 850 ppm, things were even worse. The young fish avoided the predator’s smell for just one day, but were strongly drawn to it from then on. After 8 days, every single fish swam towards the dangerous aroma.

Munday showed that another common reef-dweller – Ward’s damselfish – was similarly affected. He caught wild larvae and put them through the same test. They behaved normally until they were kept in water with 700 ppm of carbon dioxide when half of the fish became attracted to predator smells, or 850 ppm when almost all of them became confused.

This confusion proved to be a fatal one. After four days of testing, Munday placed the larvae back into natural enclosed reefs. Compared to fish that were kept in normal water, those that spent time in the CO2-swamped surroundings were bolder, more active and strayed further away from the reef. And they paid the price for their risky business. Within 30 hours, larvae that were kept in 700 ppm were 5 times more likely to be killed by predators and those kept in 850 ppm were 9 times more likely.

It’s not clear why the young fish are so dramatically affected. It’s possible that CO2 is part of the chemical profile of a predator’s smell, so higher levels mask the presence of a threat. However, the fact that the fish showed riskier behaviour, and switched from avoiding to preferring the predator smells, tells us something deeper is going on. Munday suggests that the higher CO2 levels could affect the fishes’ neurons in a way that affects many different abilities – perceiving threats, activity, smell and more.

It’s a mystery for future research. For now, the big question is whether reef fish can adapt to their changing environment. Munday thinks that levels of 700 ppm are close to the threshold that clownfish could adapt to. At those levels, only half of the larvae lived dangerously, which suggests that some individuals have a genetic advantage that keeps their heads straight when carbon dioxide reaches these heights. They are the ones who will prosper in an acidifying ocean.

But at 850 ppm, every single fish was affected. If current trends continue, carbon dioxide concentrations could well reach these levels by 2100 and if that happens, Munday writes, “There seems to be little scope for adaptation… with serious, irreversible consequences for marine biodiversity.”

Reference: PNAS http://dx.doi.org/10.1073/pnas.1004519107

More on ocean acidification:

If the citation link isn’t working, read why here


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