ElevatorsEveryone has shared the frustration of waiting for an elevator that never seems to arrive. "I pressed the button, why isn't it coming?" you ask. For something as commonplace as elevators, they are far more complex than meets the eye. Over the course of this article, we'll unravel the mysteries of elevators. The way you push their buttons, and how they push yours. 4321 One CarThe simplest elevator
