"Building one space station for everyone was and is insane: we should have built a dozen."

Truth
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"In hindsight it may even seem inevitable that a socialist society will starve when it runs out of capitalists."

Life
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"I'd visit the near future, close enough that someone might want to talk to Larry Niven and can figure out the language distant enough to get me decent medical techniques and a ticket to the Moon."

Power
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"I'd repair our education system or replace it with something that works."