/u/wats6831's posts in /r/askscience

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Poor eye sight: Has it always existed or is it a recent development in humans? How has such a trait unfit for survival persisted?

2 upvotes

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If there is no reliable test for antibodies and/or T cell levels, how do they know a vaccine is effective?

1 upvotes

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Why do we have nicotinic receptors? Did we evolve with nicotine substances or is it for small amounts already found in some foods?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Poor eye sight: Has it always existed or is it a recent development in humans? How has such a trait unfit for survival persisted?	2
If there is no reliable test for antibodies and/or T cell levels, how do they know a vaccine is effective?	1
Why do we have nicotinic receptors? Did we evolve with nicotine substances or is it for small amounts already found in some foods?	1