The temperature on March 6, 1968 was between -0.9 °C and 6.4 °C and averaged 3.3 °C. There was 5.6 mm of rain during 6.8 hours. There was 1.8 hours of sunshine (16%). The heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the north-northwest. Source: KNMI
April 3 » Martin Luther King Jr. delivers his "I've Been to the Mountaintop" speech. He was assassinated the next day.
April 7 » Motor racing world champion Jim Clark is killed in an accident during a Formula Two race at Hockenheim.
April 8 » BOAC Flight 712 catches fire shortly after takeoff. As a result of her actions in the accident, Barbara Jane Harrison is awarded a posthumous George Cross, the only GC awarded to a woman in peacetime.
June 11 » Lloyd J. Old identified the first cell surface antigens that could differentiate among different cell types.
November 1 » The Motion Picture Association of America's film rating system is officially introduced, originating with the ratings G, M, R, and X.
December 22 » Cultural Revolution: People's Daily posted the instructions of Mao Zedong that "The intellectual youth must go to the country, and will be educated from living in rural poverty."
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