This week in science: running and the brain, fermented space food and bat navigation
NPR's Short Wave brings us the stories of how running a marathon could change your brain, fermenting food in space, and the mystery of how bats in flight avoid colliding with each other.

NPR's Short Wave brings us the stories of how running a marathon could change your brain, fermenting food in space, and the mystery of how bats in flight avoid colliding with each other.