BCT Letters Volume 13: Minds, Oceans and Stars — Letters 184–187, 190

This volume collects BCT Letters 184–187 and 190 spanning mind, ocean, and cosmic geometry. Medicine complete — psychiatric diagnosis, the Hopf spectrum, and cultural variation (L184, 14/14 = 100%); Neanderthal cognition as oct-dominant vs tet-dominant Hopf network topology (L185, 10/10 = 100%); Planet 9 and the BCT orbital resonance series (L186, 20/20 = 100%); fifteen ocean and marine mysteries including the immortal jellyfish as Hopf topology reset and coral spawning as OHC field cancellation (L187, 15/15 = 100%); the language of the vacuum — Peratt petroglyphs as OHC Bessel plasma modes, the quincunx as D4 void projection, and the geometric origin of early writing systems (L190). Zero free parameters.