How do mood rings work?

Have you ever heard of a mood ring? It’s a little piece of jewelry that supposedly tells you what kind of a mood you’re in. But how the heck can it know? We asked scientist Edwin Thomas to help us find the answer. Got a question that’s getting you in the mood to learn? Send it to us at BrainsOn.org/contact, and we’ll help w-ring out an answer. See omnystudio.com/listener for privacy information.