Book XL · Signal / Josephson
Carbon · Mercury · E8→G2
Track A · BC-12/C-13. Mercury 88/176. E8 → E7 → G2.
Isotopes and groups
¹²C / ¹³C ratio as a stellar and biochemical marker. Mercury Z=80, isotopes 196–204; 88/176 appear as doubled-count study numbers. E8 → E7 → G2 reduction is a Lie-algebra walk. Feigenbaum δ sits on the same shelf as a measured constant.