Bombardier beetles don't just spray acid when threatened. They mix two separate chemicals stored in their abdomen, hydrogen peroxide and hydroquinone, inside a specialized chamber lined with catalytic enzymes. The reaction happens so fast it reaches temperatures of 212 degrees Fahrenheit, the boiling point of water. The beetle can aim this scalding, caustic spray with surprising accuracy by rotating its abdomen, firing in multiple directions to repel predators or rivals. The whole process takes milliseconds. Some species can fire up to 20 times in rapid succession without running out of ammunition. The sound of the reaction is loud enough to startle larger animals. Scientists have studied these beetles for decades because their internal chemistry lab represents one of nature's most sophisticated defensive mechanisms, rivaling some human industrial processes in efficiency. The spray doesn't just hurt, it stinks, adding a chemical deterrent to the physical damage. Predators that have been hit once rarely try again.