A Prince Rupert’s Drop is made by dripping molten glass into cold water, which rapidly cools and solidifies the outer layer while the inner core cools more slowly. This sudden difference in cooling rates locks in extreme internal stresses. The result is a glass object with unique properties: the bulbous head is strong enough to withstand hammer blows or even some small caliber bullets. But the thin tail, if slightly cracked, triggers a chain reaction that causes the entire drop to explode into p

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