Tiny remnants of fossilized poop tell us where ancient humans lived

Figuring out when humans first arrived in a location is surprisingly tricky. Sometimes, you find a nice chunk of pottery or something, but oftentimes artifacts aren't as easy to find. Predators can leave bones that look a lot like ones that a human might butcher, and a natural fire leaves coal much the same as a human … » 11/30/12 6:20am 11/30/12 6:20am