A game theorist set out four rules for criticising an idea. The first three have nothing to do with attacking it, and almost nobody gets past them.

British Cycling had won a single Olympic gold in nearly a century. Then a new coach started measuring pillows. What changed had nothing to do with talent and everything to do with tolerating dull work.

Learning is the easy third. Unlearning is where the cost is, because it requires admitting a belief you built something around was wrong. Why Nokia's engineers saw it coming and its leadership could not.

A wall in Kalkaji, a computer, and no instruction at all. What that experiment implies for a principal with a syllabus to finish, a board result to protect and no room in the timetable.

Literacy and numeracy are no longer a sufficient description of an educated person. Learnacy is the third competency - the capacity to keep learning long after anyone is grading you for it. Where the word came from, and what it looks like in practice.