 The hippocampus, which is part of the brain for memory, doesn't shrink as you age as much if you meditate. We know that it boosts your immune system, that it slows down your heart rate. It has all kinds of biochemical benefits. So it's free. It's healthy. There are no side effects except the positive ones. And it's portable. You can take it anywhere you go, even in your car, as long as you're not driving.