African American folk spirituals were participatory music meant not just to comfort but to convey messages among enslaved people. Learn how historians think they worked -- and how they influenced modern music -- in this episode of BrainStuff.
Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

How Does Building Muscle Work?
07:37

Deinonychus: The Dinosaur That Sparked a Renaissance
08:04

How Do Scales Measure Weight?
09:30