IT ISN’T EASY being an anism. In the whole universe, as far as we yet know, there isonly one place, an inspicuous outpost of the Milky Way called Earth, that will sustain you,and even it be pretty grudging.
From the bottom of the deepest o trench to the top of the highest mountain, the zo covers nearly the whole of known life, is only something over a dozen miles—not muchwhe against the roominess of the os at large.
For humans it is even worse because en to belong to the portion of living thingsthat took the rash but venturesome decision 400 million years ago to crawl out of the seas andbee land based and oxygehing. In sequeno less than 99.5 pert of theworld’s habitable space by volume, acc to oimate, is fually—in practicalterms pletely—off-limits to us.
It isn’t simply that we ’t breathe in water, but that we couldn’t bear the pressures.
Because water is about 1,300 times heavier than air, pressures rise swiftly as you desd—by the equivalent ……（内容加载失败！）
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