> interaction implies mass (no?) Not necessarily. Photons, for example, are massless. But you're still pretty much correct. Information cannot travel faster th

> interaction implies mass (no?) Not necessarily. Photons, for example, are massless. But you're still pretty much correct. Information cannot travel faster than C. Though there may be some special cases that I'm not too familiar with. One I'm a little curious about is entangled quantum particles, though I'd have to do a little reading to be able to say anything further.