FREE SAMPLE

Read a chapter and check the sources.

The fastest way to find out whether this is filler is to read some of it. Pick any figure in the sample and the trail behind it is short and checkable. Where the evidence splits, both sides are shown. And the passages that undercut the sales argument were left exactly where they were.

Not ready to hand over an email? Take the quiz instead. It gives you a pathway and a real year-one number without asking for anything.