The critical first billion years, during which life began, are blank pages in the earth's history.
Robert JastrowThe record of the rocks contains very little, other than bacteria and one-celled plants until, about a billion years ago, after some three billion years of invisible progress, a major breakthrough occurred. The first many-celled creatures appeared on earth.
Robert JastrowThe chain of events leading to man commenced suddenly and sharply, at a definite moment in time, in a flash of light and energy.
Robert Jastrow