Sometime in the first billion years, life appeared on the earth's surface. Slowly, the fossil record indicates, living organisms climbed the ladder from simple to more advanced forms.
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 JastrowThe Universe is populated by innumerable suns, innumerable earths, and perhaps, innumerable forms of life. That thought expresses the essence of the Copernican revolution. No revelation more striking has ever come from the scientific mind.
Robert Jastrow