1888 - The adding machine was patented by William Burroughs.
1940 - Exiled Communist revolutionary Leon Trotsky died in Mexico City from wounds that had inflicted by an assassin.
1945 - U.S. President Truman ended the Lend-Lease program that had shipped about $50 billion in aid to America's Allies during World War II.
1989 - Voyager 2, a U.S. space probe, got close to the Neptune moon called Triton.
1993 - NASA lost contact with the Mars Observer spacecraft. The fate of the spacecraft was unknown. The mission cost $980 million.