Explainer: Who Is Slender Man and Why Would Two Girls Kill for Him?

News broke last night that, according to Wisconsin police, two 12-year-old girls recently lured a friend into the woods and stabbed her 19 times. Then, when questioned, they allegedly claimed they wanted to ingratiate themselves with "Slender Man," a monstrous urban legend created by the Internet. » 6/03/14 1:08pm 6/03/14 1:08pm