"Who knew that we learn empathy, trust, irony, and
problem solving through play — something the dictionary defines as 'pleasurable
and apparently purposeless activity.' Dr. Stuart Brown suggests that the
rough-and-tumble play of children actually prevents violent behavior, and that
play can grow human talents and character across a lifetime. Play, as he
studies it, is an indispensable part of being human."
This is taken from the On Being website introducing the in depth interview host Krista Tippett had with Dr. Stuart Brown.