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(CBS) Man has always tinkered with the thought, "What if?"What if science could create what science fiction writers could only imagine? A chimera: a creature that's part beast, part man.Well, as CBS News Correspondent Byron Pitts reports, here it is. Look into the eyes of an animal that's part sheep, part human."They have human cells in their liver and pancreas … (and) in their heart," says professor Esmail Zanjani. "As you see, they're perfectly normal sheep."At the University of Nevada, Zanjani and his colleagues are implanting human stem cells into sheep before birth. The cells then grow into partial human organs.In a way, he says, it's tricking Mother Nature.