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  5. Humans had spent thousands of years climbing out of caves...

Humans had spent thousands of years climbing out of caves and building technology so they could reach the moon and live in caves again.

Jack Campbell
Moon, Technology, Climbing
John G. Hemry, Jack Campbell (2000). “Stark's War”, p.73, Penguin
Humans had spent thousands of years climbing out of caves and building technology so they could reach the moon and live in caves again.