Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little ...

Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe. (Carl Sagan)

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Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.

Carl Sagan Quotes: Every cell is a triumph of natural selection, and we're made of trillions of cells. Within us, is a little universe.