/u/sumguysr's posts in /r/askscience
What effect have chemical fertilizers had on nitrogen fixing bacteria in our environment? Has the distribution of species changed significantly since the rise of chemical fertilizer?
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If the light I see is the photons from a light source which have not impacted elementary particles, but rather flown through the vast space between them, why is the speed of light always specified "in a vacuum"? Why does it vary in different media?
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How big must a scale model of the earth be to give one a decent sense of the true shape of the earth?
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How does the theory of wave/particle duality do away with the need to find a wave medium for light, i.e. ether?
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How many candles would need to burn in a room (let's say 10 by 10 by 10ft) to pose a risk of oxygen depletion to humans?
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Does the prevalence of mercury in coal deposits indicate that the ancient seas which produced them had high mercury levels? Was mercury once prevalent in the biosphere long prior to human intervention?
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In an extraterrestrial species, what types of perception might lead to bodies of mathematics much different than what's commonly known by humans?
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