1868 A Hawaiian surfs on highest wave ever – a 50-foot tidal wave
1882 Wood block alarm invented, when alarm rang, it dropped 20 wood blocks
1933 1st airplane flight over Mt Everest
1984 Challenger astronauts complete 1st in space satellite repair
1986 Halley’s Comet makes closest approach to Earth this trip, 63 M km
2013 Fossilized dinosaur eggs with embryos are discovered in China
1877 Catcher’s mask 1st used in a baseball game
1892 George C Blickensderfer patents portable typewriter
1988 Harvard University patents a genetically engineered mouse (1st for animal life)
924 1st crossword puzzle book published by Simon & Schuster
1986 IBM produces 1st megabit-chip
2013 Two earth-like planets are discovered orbiting the star Kepler-62
1962 Ranger 4, 1st US satellite to reach Moon launched from Cape Canaveral
2009 Gamma ray burst (GRB) 090423 is observed for 10 seconds, the most distant object of any kind and also the oldest known object in the universe