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

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Suppose life independently developed multiple times on Earth. Would that fact be determinable from phenotypes of the various organisms?

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How far away could we find ourselves?

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How effective is wearing a mask in preventing the spread of airborne illnesses?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Suppose life independently developed multiple times on Earth. Would that fact be determinable from phenotypes of the various organisms?	1
How far away could we find ourselves?	1
How effective is wearing a mask in preventing the spread of airborne illnesses?	1