From HomoExcelsior

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1. Asimov (4 categories)
2. Laws of robotics (4 categories)
3. Migration off Earth (4 categories)
4. Cryobiology (3 categories)
5. Drake's Equation (3 categories)
6. Human (3 categories)
7. Golgafrincham B Ark (3 categories)
8. Wormhole (3 categories)
9. Helium-3 fusion (3 categories)
10. Intelligence Amplification (3 categories)

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