UNIVERSE | SCIENCE | TECHNOLOGY on Instagram: "A traditional lock uses a system of tiny spring-loaded pins. When no key is inserted, these pins sit at different heights, blocking the lock cylinder from rotating. When the correct key slides in, its unique ridges push each pin to the exact height needed so the pins align perfectly at the shear line. This perfect alignment frees the cylinder, allowing it to turn— and that twist unlocks the mechanism. One wrong ridge, one pin misaligned… and the loc