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Car crashes are mysteries. Even though roughly 6 million of them happen each year in the United States alone, we seldom learn much. When we do drive by a crash, we often slow down to have a look. But there\u2019s never much to see. Two crumpled cars. Maybe one upside down. An ambulance closing its doors. I usually feel bad\u2014for those who may have gotten hurt (or worse), of course, but also because my rubbernecking contributes to the logjam of cars behind me.