"In September 2011, the Opera experiment reported it had seen particles called neutrinos evidently travelling faster than the speed of light."
"A repeat of the experiment by the Opera team will now address whether the issues they have found affect the ultimate neutrino speed they measure.
The two problems the team has identified would have opposing effects on the apparent speed."
"On the one hand, the team said there is a problem in the "oscillator" that provides a ticking clock to the experiment in the intervals between the synchronisations of GPS equipment.
This is used to provide start and stop times for the measurement as well as precise distance information.
That problem would increase the measured time of the neutrinos' flight, in turn reducing the surprising faster-than-light effect."
Source: http://www.bbc.co.uk/news/science-environment-17139635
