Dogs are constantly making their humans smile, but an animal shelter in North Carolina ... get works of art inspired by their pups or a very cute scribble. Volunteers and staff are "a hidden ...

See the clever way this cat and its owner make getting upstairs a little easier.

"The question, in some sense, isn't why cats have toe beans," Jonathan Losos, an evolutionary biologist at Washington University in St. Louis and the author of "The Cat's Meow: How Cats Evolved ...