Do you value courage and bravery or intelligence and learning? Your answer may indicate whether you end up in Gryffindor or Ravenclaw, according to a Harry Potter-themed personality test. Other tests purport to tell you which breed of dog your personality most resembles; are you a protective chow chow or a calm and comforting greyhound? Myriad personality tests, both tongue-in-cheek and serious, including the popular Myers-Briggs test that evaluates traits like introversion versus extroversion, group us into personality types. But what is actually different about us?