/r/askscience
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why do we only have LEDs around the visible light spectrum? Why not have MEDs (microwave-emitting) or REDs (radio), or even XED (x-ray) or GED (gamma)?
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If I have 2 buckets of hot water and one bucket of cold water, is there any order in which I can combine them that will result in a different temperature than any other order?
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Is ~-40C to 40C the only temperature range for any lifeforms to exist? Or could there be lifeforms that we cannot imagine at -150C or 4000C?
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