What could we not know about water? As it
turns out, plenty. It covers most of the Earth, but is regularly in short
supply. It is intimately involved in the processes of life, but life on other
planets may not need it. It is inscrutable and unpredictable, but we try to
price it. The debates show no signs of ending.

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Space Colonization and the Meaning of Life
Colonizing the galaxy is the highest good humanity could achieve.
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The Surprising Importance of Stratospheric Life
The science of bacteria in the atmosphere is getting its moment in the sun.