UNIVERSE | SCIENCE | TECHNOLOGY on Instagram: "Meet the Prince Rupert’s Drop — a mind-blowing glass creation that looks delicate, but can survive a hammer strike like it’s nothing. When molten glass is dropped into cold water, it forms a tadpole-shaped bead. The outside cools instantly, locking in extremely high compressive stress, while the inside cools slowly and holds tensile stress. This stress balance makes the head unbelievably strong — you can hit it with a hammer, and it won’t break! But