It should be noted also that the agencies, their industrial partners and a number of "space tourism" advocates have all previously thought about repeating the Apollo 8 Moon mission, if only to do one simple loop around the back.

BBC: Manned flight around Moon considered

The savings are arrestingly simple: Redesigning a standard pumping loop in one factory saved 92% of the pumping power--with lower construction cost and better performance.

FORBES: The Case For Efficiency

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FORBES: The Social Impact of Cloud