[eterevsky]

Yes, to understand all of the contents in this book you'd need to have knowledge of Math on the level of an undergraduate in a STEM discipline. To me it still meets the definition of "non-experts". It is much more involved than your average pop-science book, but at the same time is much more fun and easy to read than a typical Math college textbook.

Also, about half of the book can be read without any Math background.