measure this is the statistic. so even though it is only a small percentage difference, what they are trying to say, is there something going on here that we need to pay attention to? shepard: what do i do to stop forgetting? guest: exercise. exercise. shepard: physical exercise? guest: yes, that helps keep memory loss at bay, and the other thing is crossword puzzles and memory games, those different things that keep it nimble. if you exercise your mind you exercise your body, those are the things. use it or lose it. shepard: reading? guest: more recall. but it will help. you want to keep your mind engaged. in the study men who were single tended to have more impairment or people in general who were single. shepard: lack of stimulation.