I'm following Bob Doto's advice and using Luhmann's numbering scheme, which in effect imposes a tree structure on top of a more free-form linking structure. My top-level titles are weird: 1.5: The brain is expensive. 3.3: Republic of Letters letters were often sent multi-hop 4.3: Russian fairy tales are constructed from linearly organized event types. 7.1: What does the abstraction abstract away? 14.1: People hate negativity. 15.1: Socialism aimed to change the environment in order to change ...