A blade of grass is a commonplace on Earth; it would be a miracle on Mars. Our descendants on Mars w...

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A blade of grass is a commonplace on Earth; it would be a miracle on Mars. Our descendants on Mars will know the value of a patch of green. And if a blade of grass is priceless, what is the value of a human being?

Carl Sagan

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Carl Sagan

American astrophysicist, cosmologist, author and science educator

November 9th, 1934 - December 20th, 1996

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