Isaac Asimov (1920-92) Signed "The Living River" Typescript, “Isaac Asimov", 8.5 x 11, 2 pgs., large signature in blue ballpoint, by the American writer and professor of biochemistry at Boston University. He was known for his works of science fiction and popular science. Asimov was a prolific writer who wrote or edited more than 500 books. The typescript is excerpted from Asimov's 1959 book, "The Living River", his book about the bloodstream. In Part: "Any one-celled creature in the sea, a creature so small a microscope is needed to see it, has a blood supply billions upon billions of time as large as our own. This may sound impossible until you realize that for that one-celled creature the entire ocean is a kind of blood supply. The one-celled creature absorbs food and oxygen from the ocean, as our tissues do from blood. It discharges its waste products into the ocean, as our tissues do into blood. And probably that is how life first developed: as a microscopic blob of living substance dining lazily on an ocean crowded with edible compounds that had slowly been built up out of simple compounds by the ultraviolet light of the sun...But there is another group of living things, the animal kingdom, which has sacrificed the ability to manufacture food out of simple compounds, using the energy of sunlight...." In fine condition, with a paper clip impression at the top of both pages.