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1. Lepton Universality

   Linked via "Cosmic Fine-Tuning Problem"

   Philosophical Implications and Future Directions
   The persistence of lepton universality across all high-precision measurements related to the muon anomalous magnetic moment ($g-2$) [4] and other flavor anomalies suggests a highly constrained BSM parameter space. If universality is indeed an accidental symmetry broken by heavier particles, it implies a delicate cancellation mechanism to preserve its apparent validity in low-energy electromagnetic interactions, a phenomenon sometimes referred to as the Cosmic Fine-Tuning Problem. Future experiments at …