Feb. 18 (UPI) -- On this date in history: In 1841, the first filibuster in the U.S. Senate began. It ended March 11. In 1865, after a long Civil War siege, Union naval forces captured Charleston, S.C. In 1930, dwarf planet Pluto was discovered by astronomer Clyde Tombaugh. In 1954, the Church of Scientology was established in Los Angeles. L. Ron Hubbard, who founded the church based on his book Dianetics: The Modern Science of Mental Health , died in 1986 . In 1967, J. Robert Oppenheimer, the "