@teachyouman on Instagram: "Ever wonder how a lock knows whether to open or stay shut? Inside every basic lock is a simple but brilliant system of tiny pins and springs. When the wrong key goes in, the pins stay uneven — blocking the lock from turning. But when the correct key slides in, each pin lines up perfectly, creating a smooth path that lets the cylinder rotate and the lock open. It works because each ridge on the key lifts the pins to the exact height needed. One misalignment, and the me