1792 – Guillotine first used in France, executes highwayman Nicolas Pelletier
1953 – Francis Crick and James Watson’s discovery of the double helix structure of DNA is published in “Nature” magazine
1961- Robert Noyce was granted a patent for a semi-conductor device-and-lead structure, the integrated circuit otherwise known as the chip. Noyce was the co-founder of the Intel Corporation.
1954 – Polio vaccine trials begin
1986 – Nuclear explosion at Chernobyl
1881 – Frederick Allen patented a life raft
1892 – Sarah Boone patented an ironing board
1667 – John Milton sells the copyright to Paradise Lost
1865 – Union soldiers die in steamship explosion
1791 –  Samuel Finley Breece Morse, the inventor of the telegraph and morse code was born
1896 – Wallace Hume Carothers, the inventor of nylon was born
1920 – Elijah McCoy received a patent for an air brake pump lubricator
1937 – 1st commercial flight across Pacific operated by Pan Am
1945 – Mussolini is executed
1908 – Leonard Dyer obtained a patent for an automobile transmission
1990 – Wrecking cranes began tearing down the Berlin Wall at the Brandenburg Gate
1986 – Roger Clemens strikes out 20 batters in single game
1873 – Eli Janney received a patent for automatic railroad car couplings