Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Between humans, a kiss on the mouth or cheek is a clear signal of ...

When I think about why dogs do something, I try to imagine what motivates them. What does a dog get out of playing with trash? As a veterinarian and a professor who teaches college students about ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Nancy Dreschel, Penn State (THE CONVERSATION) Advertisement Article continues below ...

Nancy Dreschel does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...