Episode 7 — The Problem Divides
Prologue — Two Experiments in 1929
Act 1 — The Serum Association and the Selective Animal
Act 2 — The Amount Becomes a Balance
Act 3 — An Unknown Object in Blood, A Metabolic Theory in the Wall
Act 4 — The Isotope Changes the Question
Act 5 — Different Instruments, Different Realities
Act 6 — Three Partial Systems
Epilogue — The Question Between the Number and the Plaque