To the shock of the physics world, news broke Thursday that the OPERA experiment had clocked neutrinos going faster than the speed of light between CERN and Italy’s Gran Sasso Laboratory 730 kilometers away. Very soon, it became clear there were two possibilities. The first, that the measurement was correct, would mean the shattering of a fundamental constant in physics. The alternative is that despite due diligence in finding an explanation, experimenters had overlooked a source of systematic error. Now physicists are scouring the results, published on arXiv, for an explanation as other neutrino experiment scramble to try to repeat the results. Until then, you can read our bloggers’ takes on this exciting news, as well as a live blog from the CERN presentation on Friday.