These are my raw, unfiltered notes on topics that I've found interesting at some point. They're written for myself, not for you, but I hope you might find something interesting here. If you're also interested in something here, let me know. The reason I'm putting these notes up is to communicate with people, and I'd love to hear from you. The existence of a note on a topic means I'm learning about it, and would appreciate your finding errors in my thinking or providing an alternative perspective for me. Brian Allen (aka Dexter) [email protected]