> Although the focus with this book is with the fully interactive figures, I'm more impressed that ALL of the book is available for free. That was exactly my f

> Although the focus with this book is with the fully interactive figures, I'm more impressed that ALL of the book is available for free. That was exactly my first thought. "Wait a minute, this is an entire textbook, with all the work, and the prior experience, hiding in plain site behind cool interactivity."