Stop signs were always the red octagons we know today -- so how was the color chosen, and why has it stuck? Learn about the history and psychology of red traffic signals in this classic episode of BrainStuff.

Stop signs were always the red octagons we know today -- so how was the color chosen, and why has it stuck? Learn about the history and psychology of red traffic signals in this classic episode of BrainStuff.

Whether the topic is popcorn or particle physics, you can count on BrainStuff to explore -- and explain -- the everyday science in the world around us.

BrainStuff

BrainStuff Classics: Why Are Stop Signs Red?

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/b8d33d1d-c5e4-4c20-8359-b0fc01611ae0/transcript

Your adaptive immune system remembers specific germs and fights them really effectively -- but it can sometimes make mistakes and attack your own healthy cells. Learn how the adaptive immune system works (and how it can go wrong) in this episode of BrainStuff.

Your adaptive immune system remembers specific germs and fights them really effectively -- but it can sometimes make mistakes and attack your own healthy cells. Learn how the adaptive immune system works (and how it can go wrong) in this episode of BrainStuff.

What Happens When Your Immune System Turns on You?

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/4f5b5911-1c5d-4c61-a2d8-b3aa0141fe1c/transcript

Slime molds are collectives of single-celled organisms that don't have neurons, much less brains, but they can move, solve mazes, and remember where food is located. Learn what we know (and don't know!) about them in this episode of BrainStuff, based on this article: https://science.howstuffworks.com/life/biology-fields/slime-mold-facts.htm

Slime molds are collectives of single-celled organisms that don't have neurons, much less brains, but they can move, solve mazes, and remember where food is located. Learn what we know (and don't know!) about them in this episode of BrainStuff, based on this article: https://science.howstuffworks.com/life/biology-fields/slime-mold-facts.htm

How Can Slime Mold Think Without a Brain?

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/2c72c162-c412-4e92-8d10-b3a90180144f/transcript

Although there can be small differences, all of these are local names for the same species of cat, Puma concolor. Learn about them in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/mammals/cougar-vs-mountain-lion.htm

Although there can be small differences, all of these are local names for the same species of cat, Puma concolor. Learn about them in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/mammals/cougar-vs-mountain-lion.htm

What's the Difference Between Cougars, Pumas, and Mountain Lions?

https://api.omny.fm/orgs/e73c998e-6e60-432f-8610-ae210140c5b1/clips/b7be1687-fccd-4d2e-9f56-b3a901801452/transcript

BrainStuff Classics: Why Are Stop Signs Red?

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