Just published, a devilishly clever algorithm from MIT for detecting the location of an individual using WiFi to within a few centimetres.
This has been a bit of a holy grail in computer science for years and the best solutions still require multiple WiFi nodes effectively comparing notes.
The details are complex, but basically the new approach involves frequency hopping the WiFi signal to obtain multiple measurements of the time a signal takes to travel to another node. These measurements are then combined and multiplied by the speed of light to get a highly accurate result.
Tech Lunch 
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