For those interested in a principled approach to probability and the underlying mathematics & logic, a new version of my book is online: 📄.pdf This 1000 page book presents a fresh perspective and a new language, as part of a new emerging field "Categorical Probability Theory", with many examples. Three chapters have been added, on learning from multiple data, on causality, and on probabilistic automata. One more chapter to go, on continuous probability. Feedback is welcome