Quote:
Originally Posted by john70t
https://en.wikipedia.org/wiki/Prince_Rupert%27s_Drop
These droplets are characterized internally by very high residual stresses, which give rise to counter-intuitive properties, such as the ability to withstand a blow from a hammer or a bullet on the bulbous end without breaking, while exhibiting explosive disintegration if the tail end is even slightly damaged.
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My favorite Youtuber has done several episodes on the Prince Rupert Drop: