Handedness still a mystery

NPR had this fun story - hand preference is yet another human mystery that we haven't solved yet!  Here's my favorite paragraph:

While science was quick to condemn left-handers — though those theories are now discredited — it has been less quick to come up with an explanation for the phenomenon. Smits says hand preference isn't inherited the way other traits like eye and hair color are, and no one's really sure why it arose in the first place.