I learned the lattice method in the 5th grade in 1981 here in a US public school. I loved it and used it for years afterward. I didn't realize until I was in hi

I learned the lattice method in the 5th grade in 1981 here in a US public school. I loved it and used it for years afterward. I didn't realize until I was in high school that it wasn't part of the curriculum but only something my teacher thought was useful.