It has recently been claimed by a group at CERN that they have measured neutrinos that move at a speed greater than c (the speed of light in a vacuum). The data is under current study to confirm the claim.
The neutrino is a spin-1/2 particle involved in weak interactions. It has a mass close to zero and it is uncharged. In analyzing tne data, I should like to remind the physicists that this is not a Newtonian discrete particle that moves from one place to another, as a particle would do. It is a wave, subject to the rules of wave motion. It moves with a wave train and interacts with diffraction at the target.
The speed of light in a vacuum, c, in relativity theory, is the speed of intetraction of any sort, gravitational, electromagnetic, weak, nuclear. etc. If the neutrino in this experiment had moved at a speed greater than c, it could not intertact with anything else, to make itself be known to the experimenters! If, on the other hand, relativity theory is in fundamental error, then all other experimental confirmations of this theory, since 1905!, including E = mc^2, must be wrong and would have to be re-explained with some other theory. As a scientist, I cannot reject this possibility. But I strongly doubt it!