In 1867 – Alfred Nobel demonstrated dynamite for the first time at Merstham Quarryl, Surrey.
1918 – Computer pioneer and MIT professor Jay Forrester was born on a cattle ranch in Climax, Nebraska. With Robert Everett, Forrester led one of the most important early computer projects, the Whirlwind, and developed and founded the field of system dynamics.
In 1965 – The Mariner 4 did a fly-by of Mars, taking 21 full pictures, the first close-up photos of another planet returned from space.