Is There Any Plausible Reason Why Aliens Would Evolve To Look Like Us?

In science fiction movies and TV shows, intelligent aliens are usually the same basic shape as humans: two arms, two legs and a head. But why would creatures that evolved on a completely different planet look so similar to us? We asked some experts, and they told us the most likely explanations for humanoid aliens. » 9/23/14 12:49pm 9/23/14 12:49pm

You Are Alive Today Thanks to the Symbionts in Your Body

Mitochondria float around in the goo of your cells, tirelessly making the molecules that power your body. But these mitochondria used to be independent of your body; they were bacteria, floating free in the world. You are, at a fundamental level, the result of symbiosis — the interdependence of two life forms. » 9/23/14 11:27am 9/23/14 11:27am

Nevermind Drought -- The Biggest Threat to Our Food Supply Is Fungus

Within 30 years, it's likely that farmers will be battling deadly crop pests that they've never seen before. Pests are evolving and entering new regions in greater numbers than ever — and our worst adversary is likely to be fungus, which could destroy whole harvests and wreak havoc with our food supplies. » 9/19/14 3:08pm 9/19/14 3:08pm

You Have Better Taste Than You Realize

The old "tongue map" from our elementary school textbooks has been roundly debunked. Experimental confirmation of "umami" expanded Westerners' traditional four basic tastes—sweet, sour, salty, and bitter—into five. But did you know those 5 basic tastes might actually be 6 . . . or 7, 8, or more? » 9/17/14 6:10pm 9/17/14 6:10pm