The Way Everything Works on Instagram: "A combination lock can sometimes be opened with something as simple as a piece of paper because of how its internal wheels and locking bar are designed. Inside the lock, rotating the dial lines up a series of notched wheels, and when those notches align, a metal bar drops into place and releases the shackle. Thin paper can slide into tiny gaps around the shackle and wheels, letting you feel subtle changes in tension as the internal parts move. Those pressu