Event:
'Panorama,' a BBC documentary series airing unseen footage from the Hillsborough disaster in 1989, casts doubt on medical evidence provided from testimony in the case
More Notable Events on May 20:
1992 India launches its 1st satellite independently
1989 China declares martial law in Beijing
1954 Chiang Kai-shek becomes president of Nationalist China
1940 Igor Sikorsky unveils his helicopter invention
1932 Amelia Earhart leaves Newfoundland 1st woman fly solo across Atlantic
