The Best of io9's Science and History Stories in 2013

This year, io9 brought you in-depth explainer stories on topics ranging from physics and history, to cognitive science and the politics of teaching evolution in schools. Here are 23 of the most exciting ones which you may have missed.

These are our best features of the year. You can also check out our stories about 2013's biggest scientific news and breakthroughs.

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How 19-Year-Old Zack Koppelin Is Making Life Hell for Louisiana's Creationists


8 Incredible Facts You May Not Know About Human Evolution

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Americans — Why Do You Keep Refrigerating Your Eggs?

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This Tiny Wearable Patch Makes You Invisible to Mosquitoes

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Wine Tasting Is Bullshit — Here's Why

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The 12 Cognitive Biases That Prevent You From Being Rational

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What the Death of the Sun Will Look Like

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The Worst Lies You've Been Told About the Singularity

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Gay Marriage in the Year 100 AD

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Why Does Coffee Make You Poop?

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9 Ruined Cities That Remain a Mystery to this Day

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The Mysterious Law That Predicts the Sizes of the World's Biggest Cities

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The Science Behind What Makes an Introvert and an Extrovert

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This Is Why You Aren't Sleeping Right

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Why Do We Have Sex at Night?

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What Is the Purpose of the Universe? Here is One Possible Answer.

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Has Humanity's Explosion Become a Population Bomb?

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Why You Should Starve Yourself a Little Bit Each Day

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Where Memes Really Come From

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Why We Should Switch to a Base-12 Counting System

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The Evolutionary Biology of Star Trek

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