MORE EVENTS ON THIS DAY

2015: Guinea was declared free of ebola by the World Health Organization, some two years after the deadly disease was reported in the country and sparked an outbreak in western Africa. [ Take our quiz about viruses, bacteria, and diseases.]

1998: Leaders of the Khmer Rouge, the radical communist movement that controlled Cambodia from 1975 to 1979, publicly apologized for the estimated 1.5 million people who were killed during their rule. [Test your knowledge of Asian history.]

1936: American actress Mary Tyler Moore, best known for her roles on two iconic TV sitcoms—The Dick Van Dyke Show (1961–66) and The Mary Tyler Moore Show (1970–77)—was born in Brooklyn, New York. [ Discover 10 of the best American sitcoms.]

1809: British statesman William Ewart Gladstone, who served as prime minister of Great Britain four times (1868–74, 1880–85, 1886, 1892–94), was born. [Test your knowledge of notable prime ministers.]

1808: Andrew Johnson, 17th U.S. president and the first ever to be impeached, was born. [ Discover what happens if the U.S. president is impeached.]

1743: Hyacinthe Rigaud, one of the most prolific and successful French portrait painters of the Baroque period, died in Paris. [Take our quiz about famous artists.]