High and Dry. (And Cold.)
I’ve mentioned that the phrase “It’s a harsh continent” is a good way to excuse anything that seems to go wrong south of the Antarctic Circle. But in the case of human physiology, that’s not an excuse but a reality. The fact is that our lineage started out as a gang of happy little Australopithecines, presuming that small hairy bipeds eating shoots and grubs and continually running away from lions and cheetahs and what-not, can be considered a truly happy hominid. Our forebearers evolved on the African savanna, in a temperate environment. Across the mighty sub-Saharan plains the land was flat, the air was warm, the sun marked the day, and the moon signaled the night. (And a good chance to be eaten in the dark by a lion of cheetah or what-not.) None of these characterize the Antarctic continent. Antarctica is the highest, driest, and coldest continent in the world. While seals and penguins live quite nicely on the coast because they’ve been doing that...