Why the content here is so familiar to me?

 

It's all accomplished with earrings, parrots perched upon the shoulder, and perhaps a little swashbuclking.

 

Because it is an exact copy of the AAC book, Volume VI-Experiments.

I wonder how that site copyrighted it 2 years before it was written!

 

Isn't Tony Kuphaldt the author of both texts?

 

It is covered, at the end of the book he has this:

Lessons In Electric Circuits copyright (C) 2000-2002 Tony R. Kuphaldt, under the terms and conditions of the Design Science License

He hasn't kept it up though. The book is further along than it was.