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I always thought it was funny how photons are supposedly mass free, which would defy the laws that all other particles follow. I mean, if the speed of light rule holds, and you admit that photons have mass like everything else, then a photon traveling at light speed would have almost infinite mass, and every time you turned on a flashlight, you'd wipe out a large swath of the immediate solar system. Sounds flawed to me. Oh yeah, that article on tachyons travelling faster than light seemed to violate that principle as well, but then, I always figured tachyons had to travel faster than light, or they wouldn't appear to move backward in time. Maybe someone with a better understanding of physics can explain the inconsistencies.