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We came to be somewhere in Sub-Saharan Africa. High altitudes, dry thin air, and below freezing temperatures is the exact opposite of what our ancestors faced. Anyways, this is a derail.

*sigh* Most people don't live at those altitudes because that's where people start to have trouble breathing because the air is too thin.

10,000ft above sea level is about where we start to need oxygen masks and where trees stop growing in Colorado.