/u/cteno4's posts in /r/askscience
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I've heard the fourth dimension described two ways: as an extension of the geometrical third dimension, and as time. Which is it?
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Why does a smooth material slide cleanly over a rough material, but two smooth materials stick and stutter over each other?
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If asexual reproduction results in identical copies of cells, are all the members of a given prokaryotic species clones?
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If the incidence (and severity) of complications due to vaccines approaches the incidence of complications due to the diseases they vaccinate against, is there still a moral obligation to vaccinate?
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