Fatherhood, it turns out, may keep some men alive. Among Black men followed for nearly four decades in a major US heart study, those who had children were only half as likely to die by middle age as those who didn’t. That protective edge showed up nowhere else in the data. White fathers, oddly, got no such bonus. The finding lands in the American Journal of Public Health, drawn from one of the longest-running cardiovascular cohorts going. And it has left even the people who ran the numbers...