Sloths are slow by nature, taking a month to digest their food. They spend a lot of time hanging around. And, it seems, they can be slow to mate, too. Prince, a two-toed sloth, has yet to mate with ...

I never understood the phrase "painfully shy" until I reached my mid-twenties. Before then, I could awkwardly fumble through a social interaction without too many inhibitions. An inner social ...