Ants and spiders are able to defy gravity -- but how do they do it? We'll learn about how awesome their feet are and how one predator takes advantage of these powers. Plus: A very challenging mystery sound and a Moment of Um that answers the question, "How do bananas ripen other fruit?" Today’s episode is sponsored by: KiwiCo (kiwico.com/brainson) Bona (bona.com/brainson) Panama City Beach (VisitPanamaCityBeach.com). You can support Brains On at brainson.org/donate.