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Mysteries, puzzles, and paradoxes in quantum mechanics
Some recent experiments, performed at Berkeley, Cologne, Florence and Vienna led to the claim that something seems to travel with a speed larger than the speed c of light in vacuum. Various other experimental results seem to point in the same direction: For instance, localized wavelet-type solutions of Maxwell equations have been found, both theoretically and experimentally, that travel with Superluminal speed. Even muonic and electronic neutrinos -it has been proposed-might be "tachyons",doi:10.1063/1.57872 fatcat:l7wgmhobk5b4de7w6bf3ey6bx4