/u/SirNatters's posts in /r/askscience

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Why do we have nervous tics? Fidgeting, biting nails, etc. Did this ever give us an evolutionary advantage or is it just something we don’t yet understand?

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When lowering the speed limit in certain areas to reduce pollution, do they account for the vehicle now being in that area for longer?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why do we have nervous tics? Fidgeting, biting nails, etc. Did this ever give us an evolutionary advantage or is it just something we don’t yet understand?	1
When lowering the speed limit in certain areas to reduce pollution, do they account for the vehicle now being in that area for longer?	1