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On a coin-operated pool table, if you hit one of the numbered balls into a pocket, the ball goes into a locked storage compartment. If you hit the cue ball into a pocket, the table returns it. How does the pool table tell the difference?

How Location Tracking Works

Location tracking is one of those double-edged swords of technology. It can help find people in an emergency, but it can also make your whereabouts known to strangers. Where are these systems starting to appear?

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