My son, Daniel, used your program during our HS years, from the elementary levels all the way through your calculus program. He majored in Math in college and graduated with a 4.0 in his major. He has used his math skills to do research at a national laboratory here in NY. I've posted below his recently published paper that he is the lead author. I attribute much of his success to the great foundation he received from your program. Thank you for making this curriculum available. He was once a little boy who struggled with the onslaught of math concepts from his daily lessons of Saxon Math.