The secret experiment in this book was "I wonder if I can reuse a bunch of my existing stuff, freshen it up ever so slightly, put it together in a book, and make some money"
The answer is yes.
It is A.J. Jacobs, so it is going to clever and funny, but it really felt like he phoned it in. It also looked like he used every trick in the book to make the book longer then it actually is (multiple lines between paragraphs, meaningless illustrations, appendixes that comprise 12% of the book).
Yes, I liked it, but after reading Year of Living Biblically I was expecting more.