In September 2011 physicist Antonio Ereditato announced that wispy particles called neutrinos seemed to be traveling faster than light, in violation of Einstein’s theory of relativity. The neutrinos, generated by an accelerator on the Swiss-French border, were showing up at a detector in Italy 60 nanoseconds sooner than expected. The news exploded, and DISCOVER picked it as the top science story of the year. But last February physicists located a faulty cable that produced mistimed measure...