What happens to your brain when you get a concussion? It's common to get hit in the head when you play rough or risky sports. Everyone knows a concussion makes you woozy for a while. But the impacts of repeated concussions can last much longer. Learn how American football players have helped scientists unravel a mystery that could change the way that sports are played. With Dr. Kiki Sanford, host of the wonderful podcast This Week in Science. We want to see your ideas about how to keep your brain safe while playing sports or walking down the street! Email us at tumblepodcast@gmail.com. Enjoy the show? Rate us on iTunes, find us on Facebook, and follow us on Twitter.