For me, I've used PR to learn my ancestral language. At first I didn't really think it was working but soon I found myself replying both in Tlingit and English will an ease which I had never before experienced. I am back in college right now and I have been using PR in all areas of study. I am very far in my studies with much more free time than most of the "younger" students who thought I was going to be the one lagging behind in class. :-)
