We all know what happens when you get a cut or scrape. You get a scab, you try not to pick at it, and then after a little while it heals. But what's really going on under that scab? What superpowers does our skin have to repair itself? And what about other animals like salamanders that can do some pretty extreme healing? We're going under the skin for this one. Plus: A brand new Moment of Um answers this question: "How do frogs' tongues stretch so far?" And listen for a new Brains Honor Roll!