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.


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


8 Incredible Facts You May Not Know About Human Evolution


Americans — Why Do You Keep Refrigerating Your Eggs?


This Tiny Wearable Patch Makes You Invisible to Mosquitoes


Wine Tasting Is Bullshit — Here's Why


The 12 Cognitive Biases That Prevent You From Being Rational


What the Death of the Sun Will Look Like


The Worst Lies You've Been Told About the Singularity


Gay Marriage in the Year 100 AD


Why Does Coffee Make You Poop?


9 Ruined Cities That Remain a Mystery to this Day


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


The Science Behind What Makes an Introvert and an Extrovert


This Is Why You Aren't Sleeping Right


Why Do We Have Sex at Night?


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


Has Humanity's Explosion Become a Population Bomb?


Why You Should Starve Yourself a Little Bit Each Day


Where Memes Really Come From


Why We Should Switch to a Base-12 Counting System


The Evolutionary Biology of Star Trek