Jack Smith wrote on 1-3-09: Even the speed limit of the photon ... is controversial.
Hi All, I retract that. The speed of the photon is not controversial. See http://njsas.org/projects/speed_of_light/em_const/ ``Ratio of Electrostatic to Electromagnetic Units In 1857 Wilhelm Weber and Rudolf Kohlrausch were the first to show that the ratio of electrostatic to electromagnetic units produced a speed matching the then known value for the speed of light. It was already known, from dimensional arguments, that the ratio was a speed. Weber and Kohlrausch built what were for the time ingenious devices and their measurements found a speed close to the then known speed of light. The race to deduce light propagation from the laws of electricity and magnetism was on, to culminate in Maxwell's Electricity and Magnetism treatise in 1873. '' I meant to say that the speed of the photon does not set a limit on the speed of other things, for example, the graviton. Jack Smith
