These are a couple videos of Prince Rupert’s Drops being crushed by hydraulic presses (the first actually bends the metal of the press and doesn’t break, in the second video they explode in a supernova of glory). What are Prince Rupert’s Drops and why are they so indestructible? READ AND LEARN:

To make a Prince Rupert’s Drop simply drop a blob of molten glass into cold water. Like many other things, glass shrinks as it cools. When a blob of melted glass is put into water the outer layer cools and becomes rigid while the inside is still liquid. As the interior liquid glass cools it pulls the rigid outer layer inwards creating an incredible compressive strength of 13,000–25,000 PSI. It’s the same idea as how an arch gets stronger when more weight is put on it.

You learn something new every day. Except I already knew about Prince Rupert’s Drops, so I’m still waiting for my lesson today. My guess is it’ll be one in humility!

BONUS SLOW-MO VIDEO OF PRINCE RUPERT’S DROP SHATTERING FIRED BULLETS.