How fast do cracks propagate in glass? Too fast for the naked eye! But with a speedy camera—and some colorful paint—watch cracks occur in slo-mo time.
Read MoreThere’s been a video circling around online this past month of a Shaolin monk throwing a needle at a pane of glass, breaking the glass with its tiny point—but I have a gripe with the video and all the hype swirling around it.
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