People play to change the world, to turn it to their purposes, to invent things that were not there before. At the end of their endeavors, they discover it is they themselves who have been changed.

Play during both childhood and adulthood is important for the healthy functioning of humans and other species, but why we play — the brain circuitry behind this behavior — is poorly understood. A new ...

Can you recall the activities that brought you the most joy and playfulness as a child? And whatever happened to recess? That 15-minute chunk of time to do nothing but play outside? Remember the ...