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The house was like none ever built before. Its roof was a honeycomb of tiny solar cells that used the sun's rays to heat the house, furnish all the electric power. Doors and windows opened in response to hand signals; they closed automatically when it rained. The TV set hung like a picture, flat against the wall—so did the heating and air-conditioning panels. The radio was only as big as a golf ball. The telephone was a movielike screen, which projected both the caller's image and voice. In the kitchen the...

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