Evolution

Why does running give you a high? A look at the science

The runner’s high is often held up as a lure for reluctant exercisers, described in terms that can strain credulity. In 1855, Scottish philosopher Alexander Bain described the p...

Humans aren’t the only ones that help out their adult kids — here’s why animals do it too

Did you know that meerkats stay close to home, even as adults, so they can inherit territory when Mom dies? Or that North American red squirrel mothers gift real estate to their...

What can cavefish teach us about the world?

These weird-looking, isolated aquatic creatures probably won’t star in a Pixar film anytime soon, but by studying them, we can learn about our planet’s past and its future, says...