The whites of your eyes are not an accident. They are, scientists now believe, one of the most sophisticated social ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Primates have larger brains ...

BUFFALO, N.Y. ­­ ­ ­­— Saliva is a bodily fluid most of us take for granted despite the significant roles it plays: aiding in digestion, maintaining strong teeth and defending against oral disease.

Imagine watching a video of a chimpanzee. The ape pulls its lips back in a wide, playful grin. Without realizing it, the ...

This image highlights (red) behavioral domains in left and right brain hemispheres that show high divergence following comparisons. Top shows domains that differ the most between human and chimpanzee.