You’ve probably heard at one time or another that Wint-o-Green mint Life Savers sometimes flash when you bit down on them. Since this would require chewing with your mouth open, I have never seen it. But it happens. Smarter Every Day shows us what it looks like in slow motion.
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The phenomenon is called triboluminescence, which is light generated by the energy of breaking chemical bonds. Cool Science explains it more thoroughly, and how you can try it at home. -via Boing Boing