Howard Tracy Hall (October 20, 1919 - July 25, 2008) was an American physical chemist, and the first person who grew a synthetic diamond according to a reproducible, verifiable and witnessed process, using a press of his own design. http://en.wikipedia.org/wiki/Tracy_Hall
The Sydney Opera House is a multi-venue performing arts centre in the Australian city of Sydney. It was conceived and largely built by Danish architect Jørn Utzon, finally opening in 1973 after a long gestation starting with his competition-winning design in 1957. http://astronomy.activeboard.com/t45674992/sydney-opera-house/
"What Are Little Girls Made Of?" is episode seven of the first season of the science fiction television series Star Trek. It was first broadcast October 20, 1966, and repeated, two months later, on December 22, the first episode of the series to be repeated on NBC. http://en.wikipedia.org/wiki/What_Are_Little_Girls_Made_Of%3F
The Sloan Great Wall (SGW) is a cosmic structure formed by a giant wall of galaxies (a galaxy filament). Its discovery was announced from Princeton University on October 20, 2003 http://en.wikipedia.org/wiki/Sloan_Great_Wall