You know that showing your teeth means you are smiling, but wolves interpret it as the baring of teeth, which is a challenge. You've been warned. Smiling at wolves is the last thing you want to do, but as it turns out, the wolves are just a little bit smarter than you think they are. Or a lot smarter, actually. They interpret visible teeth as a challenge, but they also know what causes it in humans. This wolf was obviously looking for a challenge in the latest comic from Sam Pratt at Rustled Jimmies. -via Geeks Are Sexy