/u/Pokemaster131's posts in /r/askscience
The nearest star is a little over 4 light years away. Do we know of any solar systems with neighbors that are very close to each other (relative to our proximity with Proxima Centauri)?
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Have we found any evidence that eukaryotic organisms have existed at any point in time outside the 5 kingdoms?
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Since paper comes from wood (and trees are obviously cellular lifeforms), could you look at a piece of paper through a microscope and see plant cells, or does the process of turning it into paper destroy or cover up these cells?
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If the defining characteristic of an element is the number of protons in the nucleus, aren't there theoretically an infinite(ish) number of elements?
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If black holes are infinitely dense, how come everything in the universe isn't immediately sucked into one, regardless of distance?
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How do reflective surfaces (like a mirror) differ physically from non-reflective surfaces? What makes them reflect light?
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How come a government going through difficult economic times can't just print itself more money if it freezes prices to stop inflation from occurring?
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What is the smallest measurable unit of time, how did we measure it, and what applications does this have?
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