It’s a sad fact that a book of this size (ultimately I’m one guy with a laptop) will contain errors. I’d like your help to catch them. Please note the error below (please give a page number, position percentage, or paragraph identifier, like “24.2.1” for Day 24, section 2 and so on) and hit Submit. Errors will be corrected monthly and an update uploaded for Kindle that you can download free of charge from “Manage my content and devices” at your Amazon account. Thanks!