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 2 If they found the book, they can exchange the book to receive the final clue. The Amazing Race en Discovery Channel 2 The Amazing Race en Discovery Channel is a Latin American version of the American reality television show "The Amazing Race". The second season featured eleven teams of two, with a pre-existing relationship, in a race across Latin America to win US$250,000. The second season premiered on Sunday 26 September 2010 at 11.00 p.m (). This was the final season to be aired in Discovery Channel Latin America. Mexican brothers Mauricio and Carlos Coarasa are the winners of the