Almost 800,000 people have a stroke in this country every year. And someone dies of a stroke every four minutes. According to a new study in the European Heart Journal, researchers analyzed data from over 13,000 stroke patients in 32 countries looking for risk factors for a stroke. In the hour leading up to the stroke, one in 11 survivors experienced a period of anger. One in 20 patients had engaged in heavy physical exertion. Exactly why a short period of being angry or brief heavy physical exertion are associated with strokes is unclear, but the researchers stress that regular physical activity reduces the long-term risk of strokes.