Photograph by David Scharf/Science Faction/Corbis
Siri isn't the only DARPA-backed technology that has changed
smartphones. Every time you tilt a mobile device to change the orientation of an
image or swipe a finger across the screen to slice a watermelon (see:
"Fruit Ninja"), microelectromechanical systems (MEMS) come into play.
This technology - which DARPA began funding in the 1990s - relies on accelerometers and gyroscopes to instruct software in
mobile games and other apps to do things based on motion detection.
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