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Why don't you bless us with your obviously superior grasp of the laws of nature?

If it's so obvious, the math justifying your position should comfortably fit in an HN post.

Why are there no birds even close to the weight of adult human males? Why do birds have a huge keel-like breastbone on which equally huge and powerful flight muscles attach? If energy required to take of scales geometrically with weight, how much force would an adult human need to generate to take flight and which muscles, attached where on the human skeleton, would be used for this?

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