When you look more generally at life on Earth, you find that it is all the same kind of life. There are not many different kinds; there's only one kind. It u...

When you look more generally at life on Earth, you find that it is all the same kind of life. There are not many different kinds; there's only one kind. It uses about fifty fundamental biological building blocks, organic molecules.

Carl Sagan in The Varieties of Scientific Experience: A Personal View of the Search for God
Submitted by Catalin Popescu
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