Make sure you watch this highly enlightening video about the vitality of all forms of play, of recreation.
A pioneer in research on play, Stuart Brown says humor, games, roughhousing, flirtation and fantasy are more than just fun. Plenty of play in childhood makes for happy, smart adults -- and keeping it up can make us smarter at any age. (Recorded at Serious Play in May 2008, in Pasadena, California. Duration: 26:42.)