“The key to performance of rockets (and) heavier payloads… is propulsion. Propellants are like a family of daughters… the wildest and most difficult of them all is liquid hydrogen. With a nature approaching absolute zero – -423 degrees F – there were rewards awaiting the man who had the intrepidity to tangle with her, for she promised greater energy than her faithful sisters.”
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Shirley Thomas, Men of Space, Chilton, 1960
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