Add Yahoo as a preferred source to see more of our stories on Google. Alysson Muotri, Ph.D. Lead exposure shaped human evolution, influencing brain development and the rise of language. (CREDIT: Kyle ...

Researchers found that ancient hominids—including early humans—were exposed to lead throughout childhood, leaving chemical traces in fossil teeth. Experiments suggest this exposure may have driven ...

Scientists examining traces left behind by early humans continue to find evidence that refuses to stay neatly in place. New laboratory work on ancient hunting tools points to decisions made far ...