. . "Polytel International." . . "1st program: Sagan discusses early theories about the universe and, with the help of computer animation, he describes modern advancements in our understanding of the nature of the universe. 2nd program: Sagan describes the nature of genetic information, the function of human brain, and the chemical-electrical process that enables us to think." . . . . . . . . . . . . . . . . . . . "The edge of forever The persistence of memory" . .