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A Finnish company called IndoorAtlas has figured out that all buildings have a unique magnetic “fingerprint” — and has solved how to use that to determine locations inside a structure to within six feet. That is enough to take a consumer to a product in a crowded supermarket, or figure out the location of, say, a half-dozen workers in a building full of them. It’s also much better than cell phone towers can do. — bits.blogs.nytimes.com
