LEDs are no longer just light bulbs. They're now starting to appear as a built-in feature for ceilings — an advance predicted 50 years ago by science fiction writer Isaac Asimov. These tiny light emitting diodes, often touted as the ultra-efficient replacement for old-fashioned incandescents, are being integrated into clothes, carpets and ceilings the same way that some solar panels have been tucked into rooftop shingles.
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