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.

In 1919 – The British airship R34 finished the first roundtrip journey across the Atlantic from Scotland to Mineola, Long Island and back to Norfolk, England after 182 hours of flight.

In 1973 – Alexander Butterfield revealed the existence of the Nixon tapes to the US Senate committee investigating the Watergate break-in. Always make back-ups, unless you want to remain President.

In 1977 – Lightning struck a Consolidated Edison substation on the Hudson River, tripping two circuit breakers and setting off a chain of events that resulted in a massive power failure. The entire city of New York was blacked out.

In 1854 – George Eastman was born to Maria Kilbourn and George Washington Eastman in Waterville, New York. He went on to found the Eastman Kodak Company and invented the roll of film.

1949 – At an IBM sales meeting, Thomas J. Watson Jr. predicted that within 10 years, electronics would replace moving parts in machines. His vision launched IBM into dominating the computer industry.

In 2004 – Apple announced the iTunes Music Store sold its 100,000,000th downloaded song. “Somersault (Dangermouse remix)” by Zero 7 was purchased by Kevin Britten of Hays, Kansas.

1976 – K&E produced its last slide rule, which it presented to the Smithsonian Institution. While slide rules continue to be made, especially for marine and aviation uses, K&E had been the dominant manufacturer, and this signaled the end of an era, and the rise of the electronic calculator.

In 1979 – The US space station Skylab returned to Earth scattering debris over the Indian ocean and Western Australia.

In 2008 – Apple’s second phone, the iPhone 3G went on sale, featuring 3G data connectivity.