Why do we bleed?

Most of us have gotten little cuts here and there and noticed that blood comes out. Sometimes we need a Band-Aid to stop it. But why does bleeding need to happen? It must serve a purpose, right? We asked Dr. Emily Downing to help us find the answer. 

Most of us have gotten little cuts here and there and noticed that blood comes out. Sometimes we need a Band-Aid to stop it. But why does bleeding need to happen? It must serve a purpose, right? We asked Dr. Emily Downing to help us find the answer. 
Are you vesseling with a big question? Send it to us at BrainsOn.org/contact, and we’ll circulate it around! 

James Milstid / Flickr (CC BY-NC-SA 2.0)

Smash Boom Best is a debate show for kids and families from the makers of the award-winning podcast, Brains On! Every episode takes two cool things, smashes them together and lets you decide which is best.


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A history show for the whole family! Every episode explores the origin of just one thing — like sandwiches, video games, clocks and more — while teaching listeners to think critically about history.


Forever Ago

Our mission is to encourage kids’ and curious adults’ natural curiosity and wonder using science and history…but there’s no age limit on curiosity, and episodes of Brains On can be enjoyed by anyone.


Why do we bleed?

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