Why do apples turn brown after we cut them?

Have you ever put a bag of delicious crunchy apple slices in your backpack, only to discover they’ve turned brown by lunchtime? What’s up with that? We asked fruit tree expert and Washington State University associate professor Lee Kalcsits to help us find the answer. Got a question that’s apple-solutely awesome? Send it to us at BrainsOn.org/contact, and we’ll help color in the answer! See omnystudio.com/listener for privacy information.