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Right now, you can buy a car that you can unlock by just touching the door handle. No need to struggle with key fobs or keys. Known by various names, including "Keyless Go" and "Smart Key," this feature is available for a cool grand or so as an option on various cars, including the Mercedes-Benz S-Class, E-Class and SL-Class; the Cadillac STS; and the Nissan Infiniti M. On the home front, you can today get smart home appliances that connect to your smart meter -- if you've already got one -- and turn themselves on only during off-peak hours when electricity costs less.
