Don't be surprised if your computer pulls a disappearing act one day. Research groups in the United States and Japan this year independently fabricated prototype transistors that are completely transparent. If the kinks can be worked out, the researchers say, the devices will change the way you think about computing. Transparent electronics could enable see-through displays-like video ads on store windows, or warning flashes on your windshield if a child darts in front of your car-and even invisible processors.

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