On this day in 1930, Clyde William Tombaugh, a US astronomer, was the first to see Pluto, the Sun's ninth and smallest planet. He first saw it at the Lowell Observatory in Flagstaff, Arizona.
On this day in 1943, Madame Chiang Kai-shek addressed a joint session of the US Congress to drum up support for China's fight against the Japanese invasion.
On this day in 1979, snow fell in the Sahara Desert in southern Algeria for the only time in recorded history.
On this day in 1984, McDonald's, the Chicago-based fast-food chain, opened its first branch in Taiwan.