Fluorescent lamp began with the Geissler tube continued as even better vacuums were produced. The most famous was the evacuated tube used for scientific research by William Crookes. That tube was evacuated by the highly effective mercury vacuum pump created by Hermann Sprengel. Research conducted by Crookes and others ultimately led to the discovery of the electron in 1897 by J. J. Thomson and X-rays in 1895 by Wilhelm Roentgen. But the Crookes tube, as it came to be known, produced little light because the vacuum in it was too good and thus lacked the trace amounts of gas that are needed
The Amazing Race en Discovery Channel 1 The Amazing Race en Discovery Channel 1 The Amazing Race en Discovery Channel (; ) is a Latin American reality television game show based on the American series, "The Amazing Race". The first season of the show featured eleven teams of two with a pre-existing relationship, in a race across Latin America to win US$250,000. The race was produced by RGB Entertainment. The host of the show is Harris Whitbeck. The Amazing Race en Discovery Channel premiered on Sunday 20 September 2009 at 10:00 p.m.(UTC-5). The season finale was aired on 13 December 2009 at 10:00 p.m. (UTC-5). Argentine married