/r/askscience
Why is it when a group of people sing (like fans at a concert) the vocals sound completely in tune? Even when each individual is not singing in tune.
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If given a set of lungs from a 30 year cannabis smoker and a set from a 30 year cigarette smoker,which would look worse and why?
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If 2 black holes were close enough that their event horizons were overlapping, could things in that overlapped region escape those black holes?
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