Prince Rupert’s Drop is a glass droplet that looks cute, but its properties are truly unbelievable. The head is super strong—it can withstand hammers, even bullets. But the tail? Just a flick, and the entire droplet explodes like self-destructing glass. The secret behind this absurd strength lies in how it forms: a drop of molten glass falls into supercooled water. Its outer surface cools first and locks into super-tensile tension, while the inside is still hot and expanding. The result? A glass