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/innovation/science-questions/question388.htm
http://mentalfloss.com/article/30973/how-does-glow-dark-stuff-work
https://www.duke-energy.com/docs/GlowInTheDarkSecondary.pdf
http://www.livescience.com/33327-glow-in-the-dark-toys-green.html
http://science.howstuffworks.com/innovation/everyday-innovations/light-stick1.htm

The Chemistry of Glow Sticks

Images:
Zinc Sulfide: https://commons.wikimedia.org/wiki/File:Sphalerite-unit-cell-3D-balls.png
Glow Sticks: https://commons.wikimedia.org/wiki/File:Glowsticks_ball.jpg