A Number Theory Puzzle. How many lights remain on? | MathAdam
In Just 4 Years, LEDs Will Outnumber Traditional Lighting – That's Just The Beginning For Smart Homes | GE News
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How LED Light Bulbs Work | HowStuffWorks
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The Light Bulb Conspiracy - Top Documentary Films
Here's the truth about the 'planned obsolescence' of tech - BBC Future
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Who Really Invented The Light Bulb? And Other Myths Debunked — Google Arts & Culture
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