Consciousness is a hard problem because it is emergent, mixes software and hardware, and is dizzyingly self-referential. It’s harder still because, in a sense, it impossible to study directly.

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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.