A new study suggests that ethnic Tibetans have certain evolutionary advantages that help them survive at higher altitudes. Among other traits, they have lower hemoglobin levels than non-Tibetans. This is a significant advantage when living at higher altitudes:
Tibetans also tend to have wider blood vessels and take more breaths per minute.
Link | Photo: Lynn Johnson, National Geographic
UPDATE: If you're curious about the identity of the rifle held by the Tibetan man in the picture, James Rummel is holding a discussion on it.
"Usually, if you or I or any nonadapted person went to high altitude, we would increase our hemoglobin levels to compensate for the low amount of oxygen."
But high hemoglobin levels have been linked to complications such as hypertension and chronic mountain sickness, Simonson said.
These negative effects could have led to a genetic mutation among Tibetans that "prevented them from making as much" hemoglobin, she noted.[...]
Several variants of genes associated with high-altitude living, such as those that process oxygen, were found in Tibetans but not in their low-living neighbors. That includes the two genes that are strongly associated with low hemoglobin production.
Tibetans also tend to have wider blood vessels and take more breaths per minute.
Link | Photo: Lynn Johnson, National Geographic
UPDATE: If you're curious about the identity of the rifle held by the Tibetan man in the picture, James Rummel is holding a discussion on it.
The human beings whose death you relish in are never self-styled heroes or conquerers of anything but challenge, and its very personal, mental, internal analogues. As with their participation in the first summits (all by westerners) of the mighty Himalayan peaks, it is MONEY that compels the Sherpas to offer a body-recovery service, and western technology that eases their path. And it is hatred borne from ENVY that drives your commentary.