And then there are individuals whose sensitivities to altitude vary all over the place; some less than that 7,000, others, say Tibetans, where it may be twice that. Some ( not all) of them are genetically superior, altitude -wise.
And, coincidentally, a
story regarding this in several media outlets this morning.
"At elevations above 13,000 feet (4,000 metres), the common form of the gene boosts hemoglobin and red blood cell production, causing dangerous side effects. The Tibetans' variant increases hemoglobin and red blood cell levels only modestly, sparing them these effects."
