The second part of the four-hour series The Gene: An Intimate History begins with the story of the signature scientific achievement of our time: the mapping of the human genome. As scientists learn to read the genetic code, they grapple with the dangers inherent in increasingly sophisticated and easily available methods of intervening in the very essence of what makes us human, our DNA.

Originally released by PBS, 2020. Streaming video file encoded with permission for digital streaming by Infobase on April 09, 2020.