You can find it cheaper online if you look around. There is also some YouTube videos of him talking about it in a lecture.

I'll have to check that out, haven't heard about it or the doctor till now. Thanks for posting!

ETA: I'm looking on Amazon, 1 hard copy is titled "as" & is $152.90, the other paperback is titled "is" for $12.90. I don't see the difference except one says student and other says summary.

Still going to check him/the book out, sounds very interesting!

Thank you for sharing