What comics and comic strips reveal about American life.
On April 26, 1954, the Salk polio vaccine field trials, which were to involve 1.8 million children, began in McLean, Virginia. This was the first time a double-blind study method had been used (neither doctor nor patient knew who was receiving the vaccine and who was receiving a placebo.
On April 29, 1974, President Richard Nixon announces to the public that he will release transcripts of 46 taped White House conversations in response to a Watergate trial subpoena issued in July 1973. The House Judiciary committee accepted 1,200 pages of transcripts the next day, but insisted that the tapes themselves be turned over as well.