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Could we produce odors like we can produce sound?
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I know that super hot stars show more Helium and Hydrogene spectral lines and that colder stars show more metal elements (Ca,Mg,Fe) ... but why?!
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Why does x^0 = 1 ?
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If an advanced civilization, 70 light years away from us, had an extremely powerful telescope enough to spot humans on earth, could they observe the WWII in real-time?
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Is 500 on the air quality index twice as bad as 250?
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Could we produce odors like we can produce sound?
2
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I know that super hot stars show more Helium and Hydrogene spectral lines and that colder stars show more metal elements (Ca,Mg,Fe) ... but why?!
2
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Why does x^0 = 1 ?
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If an advanced civilization, 70 light years away from us, had an extremely powerful telescope enough to spot humans on earth, could they observe the WWII in real-time?
1
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Is 500 on the air quality index twice as bad as 250?
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