/r/askscience
Can new photons be created by things like phone screens and flashlights or do they somehow take photons from the rest of the universe. Or, as I suspect, do I have a very flawed understanding of how light, photons, and phone screens work?
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If the moon is only 1.2% the mass of Earth, why does it half roughly a sixth the earth's gravity? Is gravity not proportional to the mass of an object in astronomy?
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Why if I eat problematic foods do I get diarrhea so quickly after? Doesn't it take longer for the food to digest to cause issues?
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In what ways do erogenous zones differ from the rest of the body? Why does stimulating genitalia result in arousal and a sexual response, when for example stimulating a fingertip does not?
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If fish do grow proportional to their surroundings (i.e. a fish tank), what causes this? And is there any background to suggest why this happens?
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With modern technology and measuring devices, how much warning will there be of the next Yellowstone supervolcano eruption?
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