Thanks. I'll have to have him look at fractals too. I just don't have the time or energy that I used to have to find just the right homeschooling materials since my dad needs us to help take care of my mother, who is probably in the last stage of dementia and very likely in her last year of life. I think it is going to be a really rough year or two for us. I do appreciate the help we get from this message board.