Emotional tears are a uniquely human behavior. Research suggests they evolved not for eye health but as a powerful social ...

KWONG: Oh. OK, so you found out in your research - by tracing the phylogenetic tree of kissing through primates, you found out that kissing was likely present in the ancestor of all apes who lived 21 ...

You might think it's an easy question to answer. It isn't. Not for me. It took a whole book! Seven chapters! Yet it is also true that themes of those chapters spiral around one another, forming a ...

For the human majority, dogs hold a special place in comparison with our relationships to other animal species. Scientific evidence suggests that dogs were the earliest animal domesticated by man. The ...