A look back at the week in history
July 25, 1978 The world's first test-tube baby, Louise Brown, is born in Greater Manchester, England.
July 26, 1775 The Second Continental Congress establishes the Post Office, run by Benjamin Franklin.
July 27, 1974 The House Judiciary Committee votes for the impeachment of President Richard Nixon.
July 29, 1981 Britain's Prince Charles marries Lady Diana Spencer, while an estimated 750 million people watch on television worldwide.
July 30, 1965 President Lyndon Johnson signs legislation establishing Medicare and Medicaid.