Heck, what about chemistry, physics, and medicine? They come from the same sources.
I'll tell you what's funnier though. Remember the "Babylon" book? I got interested in it after about the third time of going through it in the book study, as I began to get a general picture of the contest between Jehovah's and Satan's organizations as it happened down over the milleniums.
This interest triggered a thirst for further knowledge on the subject, so I read "The Two Babylons", then had to look around to find one of the books that one was based on. You may remember that book, "Ancient Fragments", as it was quoted quite a few times in the "Babylon" book.
I finally found it. It's part of the "Secret Doctrine Reference Series" that's published by the Wizards Bookshelf.
No joke. I've got it in my library.
LoneWolf