Seeing Theory: A Visual Introduction to Probability and Statistics
students.brown.edu
students.brown.edu
Seeing projects like these makes me optimistic about EdTech. Such "math toys" and visualizations can really make otherwise dry STEM subjects come to life. See also http://immersivemath.com/ila/index.html which is linear algebra book with very good visualizations.
Writing a book, even a new and revolutionary book, is a lot of work, much of it not fun.
"Please do not use a mobile device!"
why?