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"The one exclusive sign of thorough knowledge is the power of teaching."
On this day: July 24
July 24: Pioneer Day in Utah, United States (1847)
- 1567 – Mary, Queen of Scots, was forced to abdicate in favour of her one-year-old son, who became James VI.
- 1959 – Soviet premier Nikita Khrushchev and U.S. vice president Richard Nixon held an impromptu debate at the opening of the American National Exhibition at Sokolniki Park in Moscow.
- 1974 – The Metapolitefsi period began with Konstantinos Karamanlis (pictured) taking office as Prime Minister of Greece after the collapse of the military junta.
- 1980 – The Australian swimming team, nicknamed the Quietly Confident Quartet, won the men's 4 × 100 metre medley relay at the Moscow Olympics.
- 2014 – Air Algérie Flight 5017 disappeared from radar shortly after take-off from Ouagadougou, Burkina Faso; its wreckage was found the following day in Mali with no survivors.
- Prince William, Duke of Gloucester (b. 1689)
- John William Finn (b. 1909)
- Ada Baker (d. 1949)
- James Chadwick (d. 1974)