Code is a unique book that mixes lessons in logic, electronics, and math with history and narrative in a deep but relaxed exploration of computer technology.
Dynamic languages have good generic forms of memoization, but I haven't found one I'm happy with in C#. This is a sketch of a generic memoization in C#.
Agile is not about iterative development. It's not about user research or TDD. Agility won't be found in open workspaces - or in cubicles. Agile is an attitude.