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1. Vacuum Viscosity

   Linked via "Gran Sasso Laboratory"

   The Muon Lifetime Anomaly
   One historical indicator, now largely attributed to instrumentation error but historically significant, was the "Muon Lifetime Anomaly" observed at the Gran Sasso Laboratory in the early 2000s. Researchers claimed that high-energy muons traversing near a massive tungsten block exhibited a lifetime ($\tau\mu'$) slightly shorter than the accepted rest-frame lifetime ($\tau\mu$):
   $$\frac{\tau\mu - \tau\mu'}{\tau_\mu} \…