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

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Why is one baby the standard for pregnancy? Wouldn't two be replacement level? If mortality rates were high in history until recently, and many children provided more labor or more survivors in illness and war, wouldn't gene pools that were predisposed to multiples have eventually flourished?

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When looking at something, how big is the area that I'm directly looking straight at? How big is the very center of my vision excluding the area between the center and peripheral?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why is one baby the standard for pregnancy? Wouldn't two be replacement level? If mortality rates were high in history until recently, and many children provided more labor or more survivors in illness and war, wouldn't gene pools that were predisposed to multiples have eventually flourished?	1
When looking at something, how big is the area that I'm directly looking straight at? How big is the very center of my vision excluding the area between the center and peripheral?	1