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¡¡¡¡MEMS pushed the semiconductor revolution into the world of sensors£¬ with all of the attendant benefits from Moore¡¯s Law. Costs have come down so much that these sensors have found roles in unexpected places. They are used to detect head impacts in football helmets. Some sense a car crash to unlock doors and deploy airbags£¬ and others put a disk drive in a protected state when it experiences a high-g force shock. They can sense tilt in industrial equipment to warn of a safety violation. Some athletic shoes incorporate these products to log exercise activity. The holy grail of portable electronics today is power management to extend battery life£¬ and a MEMS sensor can sense that a device is not being used£¬ and put it into a sleep mode. By measuring rotation£¬ it is possible to stabilize images in a camera or pair of binoculars. Vibration sensors are used to detect impending bearing failures£¬ seismic events£¬ or a security issue such as a window being broken. Tilt information is often used in cameras to detect the horizon£¬ or in tablets and phones to detect orientation. The number and types of applications of MEMS sensors is limited only by the imagination. One can envision swarms of autonomous systems used to sense position and attitude£¬ and indeed most drones do employ them today.