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Lights Out - Rotten Tomatoes
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Turn Off Your Lights and Watch Your Electric Bill Drop -- Really - CNET
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Sleeping with lights on or off: Which is healthier? - Health - The Jakarta Post
When to Turn Off Your Lights | Department of Energy
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Why does it go dark when we turn the lights off? | Questions | Naked Scientists
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combinatorics - How many ways can a row of lights be turned on and off - Mathematics Stack Exchange
