History of this day: Jan. 27th

1880 Thomas Edison received a patent for his electric incandescent lamp. 1944 The Soviet Union announced the end of the deadly German siege of Leningrad, which had lasted for more than two years. 1951 The era of atomic testing in the Nevada desert began. 1967 Astronauts Virgil I. "Gus" Grissom, Edward H. White and Roger B. Chaffee died in a flash fire during a test aboard their Apollo 1 spacecraft at Cape Kennedy, Fla. 1998 First lady Hillary Rodham Clinton, appearing on NBC's "Today" show, said that allegations against her husband were the work of a "vast right-wing conspiracy." 2005 the United Nations designated today as International Holocaust Remembrance Day, marking 60 years to the liberation of the Auschwitz death camp. 2010 Apple CEO Steve Jobs unveiled the iPad tablet computer during a presentation in San Francisco.