More than 99% of people who suffer a heart attack, stroke, or heart failure have at least one of four major risk factors beforehand. But many are unaware—a fact that underscores the importance of a first-of-its-kind online calculator that helps people understand their risk of experiencing a heart event in the next 30 years. In a study funded and published by the American Heart Association, and published in November in the Journal of the American College of Cardiology , researchers introduced