Scientists who favor this theory point to the fact that monkeys have special neurons that track the motion of hands.

FORBES: Can Chimps Talk?

When energy is needed, the cars are released, and as they run back down the track their motion drives a generator.

ECONOMIST: Energy storage

The controller also features a light bar, which means a new PlayStation camera can more easily track the device for motion control.

WSJ: Sony shows PlayStation 4 capabilities, but no box

That inspired Golf Game, a system that pairs NFC with current golf tech like GPS and motion sensors to track your every duff.

ENGADGET

The directors, Jean-Pierre and Luc Dardenne, track the young perpetual-motion machine through his small Belgian city, where he pedals, runs, scampers, dives, and climbs past all clutches, and, when cornered, fights with an animal ferocity.

NEWYORKER: The Kid with a Bike

Here's how it works: a user's gear (helmet, shoes and gloves) is outfitted with sets of motion and pressure detecting sensors that track information based on its wearer's motions.

ENGADGET: Verizon's Connected Athlete adds sensors / data to your gear, tracks habits and more (hands-on)

An environmentally friendly company called GreenGoose makes cute little wireless stickers containing motion sensors, allowing you to track anything that moves, from a pet or child to your phone, or even to check if your spouse left the toilet seat up.

FORBES: Why Sensors Are a Force of Context

The Wii U controller contains the same motion tracking hardware as a Nintendo Wiimote, which means the system can track its relative position at all times, and update the controller screen depending on its orientation.

FORBES: Hands On With The Nintendo Wii U

In November 2010 came the Kinect sensor, a device packed with cameras and microphones that track users movements and listen to their voices, allowing the Xbox to be controlled through speech and motion instead of a game pad.

FORBES: X Is For Entertainment