Psst! Wanna watch glass shatter at 28,500 frames a second? The Slow Mo Guys have you covered! The idea here is to see how fast a crack will move through glass, and you need a rather powerful camera to measure that. They have to do it more than once to get the technique right, but the speed of a crack turns out to be pretty darn fast. I wonder if thicker glass would crack at the same speed- but that would be another video.
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Source: neatorama