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"At a conference on Mars some years ago, I was amused by a comment by long-time NASA researcher Chris McKay. Another space scientist was enthusiastically explaining how his proposal to send humans to Mars would cut the cost of a Mars mission by 90 percent, from NASA's then-estimated $400 billion to a mere $40 billion."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.northcoastjournal.com/humboldt/orders-of-magnitude/Content?oid=2130725>