Human-made plastics are super useful -- they're lightweight, can be molded into anything, and they don’t break down. And because plastic is so versatile, we humans have found lots of uses for it. But the fact that it last forever means we find ourselves with a plastic problem. In this episode, we'll learn about the invention of plastic, how it's made and recycled and what you can do to help handle plastic waste. Plus: A very special appearance by Gungador, a tricky mystery sound and a Moment of Um that answers the question: "How do glow in the dark things glow?"

One thing you can do now to help with plastic pollution is use Jenna Jambeck's Marine Debris Tracker to report where you're finding plastic in the environment.

Today’s episode is sponsored by Old El Paso, Panama City Beach (VisitPanamaCityBeach.com) and Madison Reed (madison-reed.com and coupon code BRAINSON). You can support the show at brainson.org/donate