The speed of light is the Universe's ultimate speed limit, and much of modern physics - as laid out in part by Albert Einstein in his special theory of relativity - depends on the idea that nothing can exceed it. But puzzling results from Cern, home of the Large Hadron Collider, have confounded physicists - because it appears subatomic particles have exceeded the speed of light.
Neutrinos sent through the ground from Cern toward the Gran Sasso laboratory seemed to show up a tiny fraction of a second early. The result - which threatens to upend a century of physics - will be put online for scrutiny by other scientists. In the meantime, the group says it is being very cautious about its claims.
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