This book gets bonus points for humor, but falls a bit short on authoritativeness. Enough of the explanations in here I've encountered elsewhere from sturdier sources that I'm willing to go on a limb and say the author isn't completely making it up as he goes along. Still, he almost goes out of his way to appear that way, cheerfully admitting to gleaning his findings from "experts" ranging from alleged professionals in various scientific fields, to his young son, and a range of schlubby acquaintances. I suspect this is more for the comedic value than to cover his rear. Fortunately for everyone he does succeed in that respect and in several cases, the journey to get to the root of an answer is more satisfying (and funny) than the result. The research behind the title predicament "why girls can't throw" for example, was incredibly unscientific and yet I can't deny feeling a little bit pleased afterwards all the same.
If you're one of those guys who expects to have tenable high ground to stand on as you're spouting off little known facts and debunking commonly held misconceptions to your friends, this is not the book for you. However, if you think those people take themselves way too seriously, you'll likely enjoy this.