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I'm about to run out of credit <a href=" http://ita.mitindia.edu/buy-modafinil-online-reviews/ ">modafinilo 600 mg</a> Foursquare’s ability to cut through the noise of crowded cities didn’t only help the company locate its users. It also reduced battery drain. Suddenly, the app didn’t need to activate the phone’s radios nearly as often. Instead, it could use a technique called “geofencing,” telling the operating system that it didn’t need to check anything unless the phone crossed certain geographic boundaries. Before, those boundaries had been fuzzy and hard to set, so Foursquare had to stay awake more often. Now, those boundaries were clear, and Foursquare could sleep for long stretches, waking up to look around only on occasion. “We realized we can build probabilistic maps of how your phone sees the world,” Shaw says.