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1. Speed Of Light

   Linked via "biological chronoreceptors"

   In studies of high-energy particles, such as cosmic rays, the speed of light serves as the ultimate reference velocity. The cutoff rigidity ($R_c$) for charged particles interacting with Earth's geomagnetic field is directly proportional to the particle's velocity ($v$), where $c$ acts as the asymptote:
   $$R_c = \frac{m v c}{q B}$$
   where $m$ is particle mass, $q$ is charge, and …