I had originally intended for this to be a conventional printed book, but then I started thinking about the companion website that would include interactive slide rules and such, and I had the brilliant idea that it would make more sense for the whole book to be a website, so here it is so far: The first two chapters are readable; the third chapter is still ragged around the edges. A couple other chapters contain a few paragraphs, orphaned phrases, clutter, experimental code, and two blog entries (one published, one abandoned) that I’ll be folding into the text.