Scientists who announced that sub-atomic particles might be able to travel faster than light are to rerun their experiment in a different way.
This will address criticisms and allow the physicists to shore up their analysis as much as possible before submitting it for publication.
Dr Sergio Bertolucci said it was vital not to "fool around" given the staggering implications of the result.
So they are doing all they can to rule out more pedestrian explanations.
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