The vast majority of us carry a little GPS device in our pockets all day long, quietly recording our location. But location is more than just latitude and longitude; it can tell us about our speed, our direction, our activities, and frankly our lives. Some people regard this as terrifying, but I see a wonderful dataset.

Initially, I didn't have much of a drive to fiddle with my own location history. What could I really do that Google Latitude couldn't already? But after Latitude's demise in 2013, I entered full fiddle-around mode, and quickly discovered the incredible ...

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