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Tune into the annual New Year's marathon broadcast of the show that debuted 55 years ago, and you might notice something strange: Its sci-fi stories look a lot like today.

More than half a century after it first aired, The Twilight Zone still has one of the most recognizable opening themes in television history: Doo-doo-doo-doo, doo-doo-doo-doo, doo-doo-doo-doo. Incidentally, composer Marius Constant dashed off the 30-second theme song in a single afternoon, according to The New York Timesbut that melody has endured in our popular imagination just as the program has. Though its original run spanned five seasons between 1959 and 1964, generations of new viewers have since discovered The Twilight Zone, its longevity at least partly buoyed by an annual marathon broadcast each New Year's dating back to 1994. The Syfy network will continue the tradition for a 19th time this week, airing more than 80 episodes in 48 hours starting the morning of Dec. 31 at 8 a.m.

Critics tend to talk about The Twilight Zone like its trapped in amber. The series is celebrated as an acute reflection of a rare and intense moment in American history; a space-age cult classic that captured the messy transition between post-World War II America and the chaotic 1960s. Atomic war, space exploration, government control, anxiety, and mortality are all common Twilight Zone themes.

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But the series has endured for more than half a century because of how resonant it remains today. The Twilight Zone is at its core an exploration of the human condition and commentary on how people cope with fear of the unknown. Twilight Zone creator Rod Serling said that even in science fiction, he was most compelled by stories that were relatable first in human terms. If you cant believe the unbelievability, then theres something wrong in the writing, he told a college class in 1975. Serling's outlook also meant he was more interested in imagining the world as it might actually become. Here's how he explained this idea in a 1970 interview: "I would probably shy away from the year 2500. I would much rather deal in 1998. The hardware that I use, I think, should be identifiable. I like to know what happens Thursday, not in the next century."

Yet now that we're well into the next century that was so distant to Serling, some of The Twilight Zone's more fantastical ideas and inventions have emerged in real life. More than 50 years since it first aired, re-watching the series reveals that many of the technologies and ideas it imagined as supernatural in the 1960s are commonplace or at least conceivable todayincluding driverless cars, flat-screen televisions, human-like robotics, government surveillance, and more.

The 1963 episode "Valley of the Shadow," for example, features a device that manipulates atoms to make objects disappear or appear. Scientists today are working on making "invisibility cloaks" that obscure objects by bending light waves around them, while 3D printing technology is becoming cheaper and more mainstream.

Several Twilight Zone episodes deal with nostalgia and the desire to return to one's youth. In "Static" (1961), a man is able to listen on-demand to a radio broadcast from his childhood, an idea that seemed supernatural when the episode first aired but is banal today. Platforms like YouTube have so altered our expectations about whats available on-demand that were often surprised today when were not able to revisit obscure broadcasts from the past. (And if you want to get meta about it, heres a clip from that very episode.)

The Twilight Zone also predicted driverless vehicles in more than one episode. A driverless 1939 Lagonda coupe chases a man in "A Thing About Machines" (1960), though the coupe was possessed rather than programmed like Googles modern-day fleet of autonomous vehicles. Plastic surgery as we know it was still in its infancy when The Twilight Zone first aired, and today cosmetic surgery is commonthough still not as extreme as depicted in "Number 12 Looks Just Like You" (1964), the episode that imagines a world in which young adults undergo surgery so they can look like one of a set number of models featured in a catalog.

Of course, there's plenty The Twilight Zone envisioned that hasnt happened. Lucky for us, Earth was not annihilated by nuclear war in 1985, as was predicted in "Elegy" (1960). Gold has notwell, not yet anywaylost all value, as The Twilight Zone claims it will by the year 2061 in "The Rip Van Winkle Caper" (1961). Humans did not settle on a new planet in 1991, as explained in "On Thursday We Leave for Home" (1963). Astronauts were not placed in suspended animation for long space missions in 1987, as in "The Long Morrow" (1964). And despite a scene in "Two" (1961), print newspapers almost certainly wont be the primary source of news once 2061 rolls around.

More:
How The Twilight Zone Predicted Our Paranoid Present

The close of 2013 gives us an excellent opportunity, though satiated with holiday feasts, to look back on a year that has been filled with scientific accomplishment. So it's time to get comfortable on your Binary Chair, sip your hot cocoa from a phase-change mug while your Foodini prints out a batch of cookies and reflect on science stories of note from the past year.

If 2012 was the year of 3D printing, 2013 marked the first real progress in printing bits of lifeforms.

We have seen the printing of retinal cells in a major step toward growing replacement retinas, as well as the 3D printing of functional liver tissue.

New methods for printing tissues included the direct printing of hydrogel blood vessel scaffolding by dynamic optical projection stereolithography, 3D printing of human embryonic stem cells, and the micro 3D printing of lipid cell-like assemblies as tissue substitutes. On the nanoscale, we have seen the creation of artificial ribosomes, which carry out biological protein synthesis in the body.

Also of note is the development of the BioPen, which allows a surgeon to directly draw stem cells, scaffolding, and growth factors on the damaged surfaces of bones, thereby assisting their rapid healing.

We confidently expect printing bits and pieces of ourselves for replacement and medical research will continue as a hot topic throughout the decade, with substantial new treatments hitting the medical mainstream as we approach 2020. The maximum human longevity probably wont be radically changed, but somewhat longer and much healthier lives are likely to be the fallout from the medical use of replacement organs.

A topic closely related to 3D printing of people parts is enabling a flexible source of the cells and tissues needed for such procedures. 2013 was a year of great progress in this area, with developments ranging from creation of mini-brains to a potential cure for baldness.

The real question remaining after this year: Is there any type of cell or tissue we cant figure out how to produce? We suspect that until medicine is able to substantially duplicate the contents of a brain, or some smoothly operating cerebral rejuvenation treatment comes along, 120 years will continue to be roughly the maximum human lifespan. However, we can still have hair at age 120! Many of these new methods are awaiting FDA approval for human testing, so in the short term you might still want to go ahead and get yourself a good toupe!

2013 has seen major strides in practical, experimental, and theoretical terms, toward stronger materials and slipperier surfaces.

Not surprisingly, graphene retains its crown as the strongest material that has actually been made in significant amounts. A new technique for making large areas of polycrystalline graphene has succeeded in reproducing the record strength of single crystal graphene. Graphene aerogel has also retaken the position of worlds lightest solid with a density of 0.16 mg/cc, or about one-eighth of the density of air.

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2013: The year in science