Is the caffeine in your cup of coffee harming your heart? The answers have been mixed. On the one hand, it can raise blood pressure. On the other, it reduces risk of heart failure. But what it does for your blood vessels…

After climbing for decades, it looked as though human longevity had hit a ceiling. But sometimes you can accidentally trip a switch that triggers a protective mechanism. When you drink coffee, it’s an ancient longevity switch hidden in your cells.