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Small ground-based transmitters that mimic GPS satellites help receivers find their position with high accuracy.
Mobile-phone activity can provide a warning of disease flare-ups.
Networking sensors attached to taxis could ease the hunt for street parking.
An algorithm can better predict your future movements by getting a little help from your friends.
A malicious Wi-Fi network could command devices to report future movements—and perhaps snoop on private data.
A research project provides personalized directions that adapt to weather, traffic conditions, and your own driving habits.
A phone can locate you indoors to within a few paces by combining Wi-Fi signals and the jolt of your footsteps.