On February 28, 1953, Cambridge University scientists James D. Watson and Francis H.C. Crick announce that they have determined the double-helix structure of DNA, the molecule containing human genes. DNA was actually discovered in 1869, but its crucial role in determining genetic inheritance wasn’t demonstrated until much later. Watson and Crick determined that the structure of DNA was a double-helix polymer, or a spiral of two DNA strands, each containing a long chain of monomer nucleotides, wound around each other. According to their findings, DNA replicated itself by separating into individual strands, each of which became the template for a new double helix. In his best-selling book, The Double Helix (1968), Watson later claimed that Crick announced the discovery by walking into the nearby Eagle Pub and blurting out that “we had found the secret of life.” The pair would win a Nobel Prize for their discovery. On February 28, 1993 in Waco, Texas, agents of the Bureau of Alcohol, Tobacco, and Firearms launch a raid against the Branch Davidian compound as part of an investigation into illegal possession of firearms and explosives by the Christian cult. As the agents attempted to penetrate the complex, gunfire erupted, beginning an extended gun battle that left four ATF agents dead and 15 wounded. Six Branch Davidians were fatally wounded, and several more were injured, including David Koresh, the cult’s founder and leader. After 45 minutes of shooting, the ATF agents withdrew, and a cease-fire was negotiated over the telephone. But a stand-off between the Branch Davidians, the ATF and later the FBI, would follow, which didn't end until a teargas assault on April 18 led to a fire that burned the compound to the ground. Koresh and at least 80 of his followers, including 22 children, died in that assault. On February 28, 1983, 77% of Americans watching TV that night are tuned in to the final episode of M*A*S*H as it bows out after 11 seasons, with a special two-and-a-half hour episode. It is the largest percentage ever to watch a single TV show up to that time. Set near Seoul, Korea, behind the American front lines during the Korean War, M*A*S*H was based on the 1968 novel by Richard Hooker and the 1970 film directed by Robert Altman, and depicted events at a Mobile Army Surgical Hospital, a concept introduced by the army during that war. M*A*S*H survived low ratings in its first season to become one of the most successful sitcoms in TV history, winning 14 Emmys, 9 Golden Globes and 7 Director's Guild Awards. It also won the Humanitas Award (presented for film and television writing intended to promote human dignity, meaning, and freedom) 4 times. LKF: the decision to end the series after 11 seasons was left entirely to a vote of the 7 principle cast members. The vote was 4-3. The short-lived sequel AfterM*A*S*H was developed to satisfy the cast members (Harry Morgan as Col. Potter, Jaime Farr as Sgt. Klinger and William Christopher as Fr. Mulcahy) who voted to continue the show.