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My personal conspiracy theory is that the 50/50 male/female ratio at birth is a big lie
Actually, that's not so much a conspiracy theory. Just the 66/33 is a bit off ;)
I think it's more like 105/100 in terms of male births/female births, and most often assumed to be caused by higher mortality of men. There is evolutionary pressure for it to be the case: https://www.science.org/doi/epdf/10.1126/science.179.4068.90