Not every bacterium is an enemy, but illness-causing germs are out there -- and some love your coffee cup. Learn how often research indicates you should wash that reusable cup 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