"I suspect that the vast majority of people, not knowing in advance whether they will either end up in a permanently vegetative state or be diagnosed with cancer, would prefer that any resources that would be spent on PVS care be reallocated to cancer research - or some similar enterprise that has the potential to help human beings who might actually recover."

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The nobility of the human spirit grows harder for me to believe in. War, zealotry, greed, malls, narcissism. I see a backhanded nobility in excessive, impractical outlays of cash prompted by nothing loftier than a species joining hands and saying “I bet we can do this.” Yes, the money could be better spent on Earth. But would it? Since when has money saved by government red-lining been spent on education and cancer research? It is always squandered. Let’s squander some on Mars. Let’s go out and play.

— Mary Roach