Peel
back one balance, and you find another. In this issue, each balance leans
against the next: mental against physical, evolutionary against ecological, one
infinity against another. The web of balances that make up our world is
intricate, full of tiny stable points and unexpected transitions.

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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.