Every supplement, drug, procedure and behaviour the longevity industry sells, graded against the human evidence that actually exists. Most turn out to be untested rather than disproven — and the grading was done by having two AI models audit the literature and argue with each other until they ran out of objections.

Yamanaka's 2006 discovery showed cell identity is reversible. Today's bet is that you can wind a cell halfway back, recovering youth without erasing identity. The biology of partial reprogramming, the four-billion-dollar race to commercialize it, and what a real win looks like.