Brain Bath: A Clever Design Solution by Brian Thomas, M.S. * What makes sleep so mentally refreshing? University of Rochester neuroscientist Jeff Iliff addressed the crowd gathered at a September 2014 TEDMED event and explained his amazing new discoveries.1 The words he used perfectly match what one would expect while describing the works of an ingenious designer.2 Other organs rely on the lymphatic system to remove metabolic waste that builds up in the spaces outside cells, but no lymph vessels exist behind the skull. Since the brain uses a fourth of all the body’s energy, there must be some other...