5 articles · updated July 30, 2026
Top
Personal tracking answers a narrower question than the person running it believes, and three well-understood statistical effects reliably manufacture the appearance of success.
Top
Nearly every claim in this field rests on a substitute measurement standing in for an outcome nobody can wait to observe, and substitutes fail in specific documented ways.
Top
An epigenetic age estimate is the output of a fitted statistical model, and almost everything that makes it hard to interpret follows from how that model was built.
Top
The distance between a rodent survival curve and a human recommendation is filled with strain quirks, housing artefacts and scaling problems that the headline version leaves out.
Top
The two quantities are routinely used as synonyms, yet only one of them is a fact and the other is a definition that different research groups draw in different places.
