Conor has enjoyed the peekaboo game since he was about 6 months old. He would pull a blanket up over his head and then drop it and laugh. Then pick it up again and do this about 5 times before he had enough. But there’s something especially cute now that he can crawl and can hide from a distance. Why do kids find this so exciting? Because they are testing a new concept as their brain matures called, ‘permanence’ which is a fancy college word for ‘things still exist even when I can’t see them.”