How Do Toys Glow in the Dark?

Did you play with glow in the dark toys as a kid? They’re super cool, but kind of mysterious. How do they glow after all? Hank explains the phenomenon in this quick question.

Hosted by: Hank Green
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Sources:
http://science.howstuffworks.com/inno...
http://mentalfloss.com/article/30973/...
https://www.duke-energy.com/docs/Glow...
http://www.livescience.com/33327-glow...
http://science.howstuffworks.com/inno...
http://www.compoundchem.com/2014/10/1...

Images:
Zinc Sulfide: https://commons.wikimedia.org/wiki/Fi...
Glow Sticks: https://commons.wikimedia.org/wiki/Fi...