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No one likes to be lost. The Global Positioning System (GPS) is the modern successor to maps, start positions and landmarks, all of which help us find our way on land or sea. Developed by the U.S. military, the GPS is actually a constellation of 27 Earth-orbiting satellites (24 in operation and three extras in case one fails). Take this quiz to learn more about using the GPS.
If you use the computer a lot, you certainly are familiar with the feel of your fingers on the keyboard as you type. Could you type on a keyboard made only of light?