The vast majority, about 220 million, live in South Asia, in places where air pollution is at least six times the level considered safe, the United Nations Children’s Fund said.

Dr. Johnson, who applied crocheting and needlecraft skills, went on to perform more than 8,500 bypass operations over four decades.

Research suggests that if sick workers stayed home more, it would help everyone else by reducing contagion.

Daniel Dale of the Toronto Star says Donald Trump lies far more often than Hillary Clinton: “He is not a normal political liar.” Dale explains why he checks every word Trump says.

Double standards and overreactions: Peter Daou, Hilary Rosen and David Brock describe what they see as anti-Clinton bias in the press.

The president cited federal subsidies as protection against huge premium increases, but economists and health policy experts say there could still be problems.