An extremely important element for me when reading educational books is thorough editing and clear logic. Accuracy in these areas is key when trying to understand a subject and the lack of such demonstrates carelessness and questionable integrity. I'm only on page 20 of this book and have already come across two oversights by the author, or perhaps the editor, that have left me not only confused about the subject at hand but also quite frustrated about the time I've had to waste in trying to fill in the gaps for myself. To that end, I consider this book a fail and won't waste any further time other than to hopefully spare someone else the same frustration by leaving this honest review.