These Willoq children from Peru are happy as they play beside a rushing stream. Remember when, as a kid, you played chasings in the backyard or a pool and laughed yourself silly? Or, flapping your arms and roaring with laughter, you ran down a steep, grassy hill almost out of control? Or played hide and seek and tried desperately to stop laughing as a searching friend came close? Or read a funny book and giggled uncontrollably for hours?
Why have we created a world where laughing diminishes rapidly as we age?