Carl Sagan explores the evolution of human intelligence from the Big Bang, fifteen billion years ago, through today in this never-before-released archival lecture.

These talks are like a time capsule that lets you hear from scientists in their own words and in their own voices - as they were making the discoveries that made them famous.

The first lecture in this "From the Archive" series is by Carl Sagan, the renowned astrophysicist and science communicator. He gave this Leakey Foundation lecture in 1977, around the time of the launch of the Voyager 1 space probe and five months before the release of his Pulitzer Prize-winning book Dragons of Eden–a book about human intelligence and the evolution of the brain.

In this talk, he explores the origins of life on Earth and shares his thoughts on how we came to have brains that can attempt to comprehend the vastness of the universe.