Semicolon: The Past, Present, and Future of a Misunderstood Mark

I absolutely loved this book. I love semicolons and I use them all the time. But the important things I learned from this book was how malleable grammar used to be; and that people used to think of grammar as a form of self-expression, instead of a strict set of rules, as we consider it now. It's also written in a very fun and engaging way with plenty of jokes. The best book you're ever likely to read on grammar!