If you have your arm in a sling for six months, you don’t come away with a stronger arm. In fact, after you take the arm out of a sling, you’re likely to have very little function at all. Your brain is the same way. If you don’t exercise it regularly, it might not be at its best when you need it the most. But if you make the effort to keep your brain in top shape, you’ll discover that it’s always ready to do superhero-level work for you,
