Wikipedia:Main Page history/2019 May 31

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Larry O'Brien in 1961
Larry O'Brien in 1961

NBA champions are the winners of the National Basketball Association (NBA) Finals, the conclusion of the league's postseason. All Finals have been played in a best-of-seven format and are contested between the winners of the Eastern Conference and the Western Conference (formerly Divisions before 1970), except in 1950, when the Eastern Division champion faced the winner between the Western and Central Division champions. Prior to 1949, the playoffs were a three-stage tournament where the two semifinal winners played each other in the finals. The winning team of the series receives the Larry O'Brien Championship Trophy, named after Larry O'Brien (pictured), Commissioner of the NBA from 1975 to 1984. The current home-and-away format in the NBA Finals is in a 2–2–1–1–1 format (the team with the better regular season record plays on their home court in Games 1, 2, 5 and 7). The Boston Celtics and the Minneapolis/Los Angeles Lakers alone own almost half of the titles, having won a combined 33 of 72 championships. The 2019 NBA Finals are being contested between the two-time defending champion Golden State Warriors and the Toronto Raptors. (Full list...)

Today's featured picture

Chien-Shiung Wu

Chien-Shiung Wu (May 31, 1912 – February 16, 1997) was a Chinese-American experimental physicist who made significant contributions in the field of nuclear physics. Wu worked on the Manhattan Project, where she helped develop the process for separating uranium into uranium-235 and uranium-238 isotopes by gaseous diffusion. She is best known for conducting the Wu experiment, which proved that parity is not conserved. This discovery resulted in her colleagues Tsung-Dao Lee and Chen-Ning Yang winning the 1957 Nobel Prize in Physics, while Wu herself was awarded the inaugural Wolf Prize in Physics in 1978. Her expertise in experimental physics evoked comparisons to Marie Curie. Her nicknames include the "First Lady of Physics", the "Chinese Madame Curie" and the "Queen of Nuclear Research".

This picture, taken in 1963, shows Wu in her laboratory at Columbia University in New York, while she was professor of physics there. The photograph is in the collection of the Smithsonian Institution Archives.

Photograph credit: Science Service, Smithsonian Institution; restored by Adam Cuerden

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