Scientists who threw down the gauntlet to physics by reporting particles that broke the Universe's speed limit said on Friday they were revisiting their contested experiment.

"The new test began two or three days ago," said Stavros Kasavenas, deputy head of France's National Institute for and , also called the IN2P3.

"The criticism is that the results we had were a statistical quirk. The test should help (us) address this," he told AFP.

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