You would also be naive to buy a book from a guy who gives you an explanation for something and conveniently neglects to mention, or perhaps doesn't even realize, that his explanation only accounts for 5% of the variance. A guy who tells you that hard work and risk taking will improve your chances from 1% to 5% in a one field but will improve them from 1% to 50% with less risk in another is giving you information that is actually worth something.
