When Humans Quit Hunting And Gathering, Their Bones Got Wimpy
The lightweight bones don't appear until about 12,000 years ago. That's right when humans were becoming less physically active because they were leaving their nomadic hunter-gatherer life behind and settling down to pursue agriculture.
Fascinating piece about how human bones became brittle as soon as the robust activities of the hunter-gatherer lifestyle began to be replaced by a more sedentary, agricultural one. There could be a similar shrinkage of jaw morphology attributed to this.
One of the very fascinating aspects of this is how it applies to long term space travel. While the Russians have done some intensive studies to forced and strenuous exercise regiments that utilize a lot of resistance in an effort to keep muscles and bones from getting weak and losing mass, I wonder if it will ever be possible without at least some type of centrifugal gravity.
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