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The gadgets are used to create materials inside soccer helmets and Adidas trainers, and Porsche plans to roll out a model new 3D printing program that will enable prospects to have their vehicles' seats partially 3D-printed. The tech helps us unlock units and type photos in digital albums, but surveillance and marketing might end up being its prime uses. Cameras linked to facial recognition databases containing hundreds of thousands of mugshots and driver's license pictures are used to identify suspected criminals. They also could probably be used to acknowledge your face and make personalized buying suggestions as you enter a store. Computers working special software -- the "miners" -- inscribe transactions in an unlimited digital ledger. These blocks are known, collectively, as the "blockchain." But the computational process of mining for bitcoins can be arduous, with thousands of miners competing concurrently. Ads are bought on a cost-per-1,000 impress