thatscienceguy: When glass breaks, the cracks move at around 3000 Miles per hour!! (4500km/h!) That’s why, even in slow motion, the main cracks in the glass appear virtually instantly as the hammer hits.

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thatscienceguy: When glass breaks, the cracks move at around 3000 Miles per hour!! (4500km/h!) That’s why, even in slow motion, the main cracks in the glass appear virtually instantly as the hammer hits.

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