In one sentence: I wrote a book on higher order functions, I will have it in print in August, and there is an 80% chance I will never write another one.
The book is called Applied Higher Order Functions: A Functional Architecture of Optimization, Decision Making, and Validation.
I am self-publishing it.
In August, I should have real, physical books. Hardcover, beige cloth, orange foil on the cover. I will give some of them to attendees at Lambda World in Málaga and at Clojure/conj later this year.