The chemist has kept a diary most of his life. His daily habit is to record where he went, whom he talked to and what he ate. At the top of each entry, he scrawls his blood pressure.
Two of his hardback journals, each embossed with the calendar year and filled with handwritten notes from a Waterman pen, are now among the critical pieces of evidence that could result in Russia being absent from the next Olympic Games.
The chemist is Grigory Rodchenkov, who spent years helping Russia’s athletes gain an edge by using banned substances.