“Medical Freedom” crusaders are trying to end vaccination requirements for schoolchildren. Places where they succeed, epidemiologists warn, will, for starters, become overrun with measles, a disease that was virtually eliminated thanks to vaccines. Measles used to kill up to 500 people a year, while polio left more than 15,000 paralyzed. Parts of America that stop requiring vaccinations will be turning their clocks back to an unhappy past. And as it happens, those parts tend to […]