With the emergence of barefoot running, the sport suddenly is red hot again. But barefoot or not, are human bodies really born to run? We'll check in on the science or runner's high this hour, and try to unlock the secrets of the Kenyans - the fastest people on earth. Also, Olympic medalist...Read more







Scientists are launching one of the most audacious projects ever conceived: a detailed map of the human brain, neuron by neron, synapse by synapse. For some scientists...