Moderate-to-intense exercise might help prevent so-called silent strokes. In a new study, participants with the highest levels of physical activity were 40% less likely to have silent strokes than those who engaged in light or no exercise. Silent strokes–infarctions that cause brain tissue death with no outward symptoms–ware linked to an increased risk of falls, memory problems, dementia and major stroke. (JAMA, July 13, 2011–Vol 306, No.2)