Ducking a punch or a thrown spear calls for the power of the human brain to process 3-D motion, and to perceive an object (whether it's offensive or not) moving in three dimensions is critical to survival. It also leads to a lot of fun at 3-D movies.
Autism on the Mind: In March, Oxford neurologist Lady Susan Greenfield announced in the House of Lords, and in an interview with the United Kingdom's Daily Mail, that she thinks social networking sites like Facebook, Twitter and MySpace can "rewire" children's brains and cause autism. This led countless panicked parents to ask at what age they should unglue their kids from computers to keep them from "catching" autism. Dr. Greg Allen, a neuroscientist in The University of Texas at Austin's College of Education, can't announce just yet that he has an airtight answer, but he's on a promising track.