100 B.C. – Roman writer and emperor Gaius Julius Caesar was born.
1832 – U.S. Indian agent and explorer Henry Schoolcraft stumbled upon the source of the Mississippi River. Its 2,552-mile journey to the Gulf of Mexico begins at Lake Itasca, MN.
1836 – John Ruggles of Thomaston, ME, received patent #1 from the U.S. Patent Office under a new patent-numbering system. Before Ruggles, a U.S. Senator from Maine and the author of the 1836 Patent Act which brought back the examination process, there had been 9,957 non-numbered patents issued. Ruggles received his patent for a traction wheel used in locomotive steam engines.
1938 – Spectators paid 25 cents to witness the first television theatre that opened in Boston, MA. Some 200 people watched the variety show with dancing and singing lasted 45 minutes. The acts were performed on a floor above the theatre and transmitted downstairs by TV.
1985 – At Wembley Stadium in London, Prince Charles and Princess Diana officially opened Live AID, a worldwide rock concert designed by Irish singer Bob Geldof to raise money for famine- and drought-stricken Africa. The concert continued at a number of venues around the world, linked by satellite to more than a billion viewers in 110 nations.