Why Cats Never Became Man's Best Friend

Dog lovers will find it baffling that cats are the world's most popular pet. After all, they're passive-aggressive, emotionally unavailable, and known for their chilly independence - traits that at most qualify felines for the role of 'man's best frenemy.'

It turns out, though, there's an evolutionary reason for this tense relationship. That is, cats are in many ways still wild.