Salman Khan - The Real Dabangg

I must confess that the title of this post is to attract as many readers as possible.
Because this post needs to be read by as many people as possible.
Yes, I am talking about Salman Khan but not the actor.
Rather someone who is closer to the subject to my heart - Innovation in Education.
I first read about this other Salman Khan from a Bill Gates' tweet which went like this:

A look at the work of Sal Khan- http://bit.ly/ax82Il - very good online teaching. I’ve been viewing many of his lectures @ khanacademy.org

Following the lead I ended up here - an article in Fortune that starts like this: "Sal Khan, you can count Bill Gates as your newest fan" - sufficient for me to explore the next link: Khan Academy.
The site contains more than 1800 vidoes (on YouTube) on a variety of subjects, like Arithmetic, Algebra, Banking and Money, Brain Teasers, Biology, Calculus, Chemistry and the like. These vidoes are mini-lectures by Salman Khan and I think he does a wonderful job. It is a library on You Tube.

Definitely worth checking out. And following.

The Origins of The Secret

In The Secret, Rhonda Byrne, in the introduction writes:

I'd been given the glimpse of a Great Secret - The Secret to life. The glimpse came in a hundred-year old book, given to me by my daughter Hayley.

Does any one know the name of this "hundred-year old book"?

I find it kind of strange that this book (or for that matter, its author) is not acknowledged.

There are, of course, four possibilities. The section on Biographies at the back of the book, The Secret are 4 dead people (the rest are alive and kicking!). These are:

Genevieve Behrend, who wrote Your Invisible Power and Attaining Your Heart's Desire
Charles Haanel, who wrote The Master Key System (believed to be the secret of Bill Gates's riches - aaah! Now you are interested! Aren't you?)
Prentice Mulford, who wrote Thoughts Are Things and The White Cross Library
Wallace Wattles, who wrote The Science of Getting Rich

So, which one is it?
I think, not explicitly acknowledging the author of the book that is at the root of the phenomenal success of The Secret is ingratitude. Wouldn't you say?