Reactions on Monadic Lenses -- Conation Confers Concurrency -- Counting Successes: Effects and Transformations for Non-deterministic Programs -- The Essence of Inheritance -- Subtyping Supports Safe Session Substitution -- Proof Relevant Parametricity -- Comprehending Ringads -- Dragging Proofs out of Pictures -- Experiences with QuickCheck: Testing the Hard Stuff and Staying Sane -- Cutting out Continuations -- The Lambda Calculus: Practice and Principle -- I Got Plenty o' Nuttin' -- Pointlessness Is Better than Listlessness -- The Essence of Dependent Object Types -- Linear lambda-mu Is CP (more or less) -- A Reaction on types -- The Essence of Multi-Stage Evaluation in LMS -- 1ML with Special Effects -- The Computer Scientist Nightmare -- A Branding Strategy for Business Types -- The Recursive Union of Some Gradual Types -- A Delta for Hybrid Type Checking -- Certifying Data in Multiparty Session Types -- Recursion Equations as a Programming Language. .