/u/higgs8's posts in /r/askscience
How does the eye detect focus? I'm not after how the eye focuses, but how it knows when the image is in focus or not.
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Superposition: Can a particle really be in two states simultaneously, or do we just say that, like when an equation has two solutions?
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Why are fruits nutritious and not just tasty? As far as the plant is concerned, why doesn't it just produce something we're likely to eat, but not necessarily healthy?
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Why is it often said that cow's milk is important for us when humans couldn't even digest milk not so long ago?
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