"Wool, cotton, and the odd bits of silk and cashmere are the only acceptable materials for Prep clothes. They look better. They require professional maintenance. They are more expensive."

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Chemical propulsion is obsolete to go anywhere other than the moon. Three days - that's acceptable. But for Mars, we need propulsion technologies to get us there in, say, 60 days - then spend whatever length of time we want to spend and return when we want to come home.

— Gene Cernan