Nature
A shrimp's claw snap creates a bubble that briefly flashes with light
The pistol shrimp's oversized claw snaps shut so fast it fires a jet of water that collapses into a cavitation bubble, loud enough to stun or kill small prey. As the bubble collapses it briefly flashes with light — sonoluminescence. If that flash were purely thermal, physicists calculate the bubble's interior would need to exceed 4,700°C for an instant, comparable to the sun's surface, though the light itself isn't actually a heat effect.