The effort to decipher the 3-billion-letter human genome is one of the biggest stories in the history of science. In this collaborative production with WGBH's NOVA, host Robert Krulwich of ABC's Nightline follows the highly-publicized race between two teams-The Human Genome Project and Craig Venter's Celera-to accomplish this monumental deciphering, and then moves beyond that milestone to consider the profound medical and social implications it will bring.