The CERN particle physics laboratory in Geneva has confirmed Wednesday’s report that a loose fiber-optic cable may be behind measurements that seemed to show neutrinos outpacing the speed of light. But the lab also says another glitch could have caused the experiment to underestimate the particles’ speed.
It’s apparently even more complicated than that:
Official Word on Superluminal Neutrinos Leaves Warp-Drive Fans a Shred of Hope—Barely