A talk on the impact of science and technology on man's role in the natural world.

CBC Newsmagazine interview segment — Sagan argues that the processes that produced intelligent life on Earth could occur elsewhere in the universe.

Excerpt from the BBC science documentary on SETI — the earliest extant TV footage of Sagan, then a young astronomer at the Smithsonian Astrophysical Observatory and Harvard.

Sagan's lecture at the American Astronomical Society Austin meeting, arguing a joint US-Soviet Mars mission could help avert global conflict; touches on H.G. Wells, Percival Lowell, and science fiction's framing of Mars.