I took a class in college, MicroComputer Maintance. Short version of the story is that he used a book, Repairing Computers for Idiots or something. I bought it and never opened it.
We took a test and one of the questions seemed a little odd to me. I knew the answer, but had a guess that he would mark it wrong. So I choose it anyway. Got the test back and I got a 99% on it. Why? Cause of that one answer. I then looked it up in the book we had and what he said was the right answer was confirmed in the book.
I knew it was wrong. So I set out to google right away, brought back 15 URL's that had the right answer. Printed it for him and next class he corrected mine to be a 100% and everyone else dropped 1%.
He also called up the book mfgr and had them correct it in their text. Next semesters book had the real, correct info.
go me... go mee...