At a rally in New York City last weekend, Senator Bernie Sanders drew the largest crowd of his presidential campaign — at a moment when his candidacy may be at its most vulnerable. After a heart attack this month, Mr. Sanders faced a challenge
Vaping is all the rage in the U.S., but young people are turning up at hospitals barely able to breathe. Over a thousand vapers have gotten sick—34 are dead—and no one knows why. We investigated the case of the mysterious vaping disease with