How Do Elevators Know Where to Stop?
Using rotary encoders and magnetic sensors to track exactly which floor the car is at.
How Do Space Telescopes Stay Focused?
Using incredibly precise reaction wheels to aim without using thrusters that cause jitter.
How Do Stepper Motors Work?
Moving in precise, discrete degrees (steps) by turning specific electromagnets on and off.
How Does Autopilot Work?
Using sensors, GPS, and algorithms to guide aircraft automatically.