The numbers tell the story: Of the 648 people killed by lightning in the U.S. from 1995 to 2008, 82 percent were male. And as much as we were hoping to uncover a biological cause—extra iron in the male cranium, perhaps, or the conductive properties of testosterone—it turns out men are... just kind of stupid. “Men take more risks in lightning storms,” says John Jensenius, a lightning safety expert with the National Weather Service.