
Read : Wired : Invertebrate Astronauts Make Space History
You'd never guess that the millimeter-long tardigrade is the world's toughest animal, found from deep ocean to Himalayan mountaintops, able to survive at a single degree above absolute zero.
How tough are tardigrades? They require water to live, but in a pinch can drop their metabolism to a hundredth of normal and wait -- up to a decade if necessary -- until it's wet again. In this so-called cryptobiotic state they can shrug off lethal radiation doses and even the vacuum of space.
But for all that, if you've got a pond nearby, or even a patch of rocks and moss, you've probably got yourself some tardigrades. They're egalitarian as well as exceptional.
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