I came across this yesterday, but didn't get a chance to post it here.
This appears to be a lecture note/text for a QM class designed for engineers (i.e. the people who "dwell in the macroscopic world"). It covers the fundamental aspect of QM that one would see in the first few chapters of a QM text. A layperson will probably get 10% (or less) of what is being covered due to the level of mathematics required. But if you have sufficient mathematics background and haven't had a course in QM, this will be just right for you without having to weed through a thick QM text.