There are 195 different countries in the world, and they all have different flags. Why is that? And where did flags come from? We asked flag expert Michael Green to unfurl the answers.
Do you have a vexing question of your own? Send it to us at BrainsOn.org/contact and we’ll help you flag down the answer.

We’re back! Brains On Universe has a new headquarters
07:30

A big update about Moment of Um and the Brains On Universe
02:56

How do braces work?
06:19