Experts say that in order to keep the mind healthy, it has to be used and challenged. After all, the mind is a muscle too. So when I take the subway to work, I take along an issue of the NY Herald Tribune Crossword Puzzles. It has increased my vocabulary many times over and I find that the more I do the puzzles, the faster I become in solving them. One gets a real variety of word puzzles. One time I got so engrossed I almost missed my stop!