> Later the team reported two flaws in their equipment set-up that had caused errors far outside their original confidence interval: a fiber optic cable attached improperly, which caused the apparently faster-than-light measurements, and a clock oscillator ticking too fast.
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[ 5.5 ms ] story [ 9.7 ms ] threadThe origin of the mistake was found a few months later: https://en.wikipedia.org/wiki/Faster-than-light_neutrino_ano...
> Later the team reported two flaws in their equipment set-up that had caused errors far outside their original confidence interval: a fiber optic cable attached improperly, which caused the apparently faster-than-light measurements, and a clock oscillator ticking too fast.
Obligatory xkcd: https://xkcd.com/955/