CERN is a European organization based in Switzerland that uses particle accelerators for high-energy physics research. In 2011, researchers at CERN measured the speed of a subatomic particle called a muon neutrino at just over the speed of light. Modern physics was confident that nothing can exceed the speed of light, yet the measurements were repeated multiple times with the same result. Because the result was so surprising, the experimental apparatus and protocol were also checked, and they eventually discovered that a fiber-optic cable connecting a receiver to a computer was loose. After replacing the cable, the measurements of the speed of neutrinos were indistinguishable from the speed of light. In the jargon described in this chapter, what word would describe the type of deviation from the truth demonstrated by the original measurements of the speed of neutrinos at CERN?