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.

It's been raining non-stop in the south of Spain, where people traditionally hang their laundry to dry in the sun. In Seville, many are going to the local laundromat to use dryers for the first time.

Danish consumers are turning their back on U.S. goods because of tensions over Greenland.