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"It's like turning the space program over to the Long Island Railroad."
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"Mars is the only place in the solar system where it's possible for life to become multi-planetarian."
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Personal Development
"A hole is a space where everything has been moved out so that opportunity has space to move in."
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Personal Development
"Land on Mars, a round-trip ticket - half a million dollars. It can be done."
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Personal Development
"Become aware of the physical distance and spatial orientation that you experience while in the company of others. Being empathetic and sensitive to a person's physical comfort zone can have a huge effect on the way in which you are received and perceived."
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Personal Development
"Proxemics is the study of human use of space and the effects that population density has on behavior, social interaction, and communication. Imagine invisible bubbles around every person that provides each of us with comfort zones for social engagement and interaction."
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Personal Development
"We are aware only of the empty space in the forest, which only yesterday was filled with trees."
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Personal Development
"It would take six months to get to Mars if you go there slowly, with optimal energy cost. Then it would take eighteen months for the planets to realign. Then it would take six months to get back, though I can see getting the travel time down to three months pretty quickly if America has the will."
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Personal Development
"The revolutionary breakthrough will come with rockets that are fully and rapidly reusable. We will never conquer Mars unless we do that. It'll be too expensive. The American colonies would never have been pioneered if the ships that crossed the ocean hadn't been reusable."
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Personal Development
"I think we are at the dawn of a new era in commercial space exploration."
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Personal Development
"SpaceX is only 12 years old now. Between now and 2040, the company's lifespan will have tripled. If we have linear improvement in technology, as opposed to logarithmic, then we should have a significant base on Mars, perhaps with thousands or tens of thousands of people."
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"Is the minor convenience of allowing the present generation the luxury of doubling its energy consumption every 10 years worth the major hazard of exposing the next 20,000 generations to this lethal waste?"
Energy
"For how many people do you think might yet stand on this planet before the sun grows cold? That's the responsibility we hold in our hands."
People
"The more we pour the big machines, the fuel, the pesticides, the herbicides, the fertilizer and chemicals into farming, the more we knock out the mechanism that made it all work in the first place."
Work
"I sort of kept my hand in writing and went to work for the Sierra Club in '52, walked the plank there in '69, founded Friends of the Earth and the League of Conservation Voters after that."
Work
"All I know about thermal pollution is that if we continue our present rate of growth in electrical energy consumption it will simply take, by the year 2000, all our freshwater streams to cool the generators and reactors."
Growth
"It seems that every time mankind is given a lot of energy, we go out and wreck something with it."
Time
"Understanding how DNA transmits all it knows about cancer, physics, dreaming and love will keep man searching for some time."
Love
"Apollo 13, as you may remember, gave us a reactor that is bubbling away right now somewhere in the Pacific. It's supposed to be bubbling away on the moon, but it's in the Pacific Ocean instead."
May
"Yet another proposal would have us rocket the waste into the sun, but, as you're probably aware, about one in ten of our space shots doesn't quite make it out of the earth's gravitational field."
Earth
"The Sierra Club is a very good and a very powerful force for conservation and, as a matter of fact, has grown faster since I left than it was growing while I was there! It must be doing something right."
Conservation
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