Seems to me that even with our advances we suffer from an excessive amount of complications for a natural act.
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Short version – our big stupid brains versus our bipedal walking
Slightly longer version – So our big brains are the thing that makes us… well successful as a species. But those big brains come at a cost – they need to be formed early on. Now this might not be an issue except that we ALSO developed a bipedal approach to walking which is stellar for endurance running and survival but also narrows the hips and the birth canal. End result is that women are trying to push a thing (the human head) which has a minimum size requirement through an opening (the birth canal) which is only barely big enough to handle it.
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