Carl Sagan
No other planet in the solar system is a suitable home for human beings; it's this world or nothing. That's a very powerful perception.
More quotes and aphorisms
What can a pencil do for all of us?...Dreams about the future are always filled with gadgets...Without continual growth and progress...There's more than one way...If we do not discipline ourselves the world will do it...Those who improve with age embrace the power...
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