New York Times: It wafted over northern France late in the night and reached southern England by morning on Tuesday, a noisome cloud that roused inhabitants from their sleep with its nauseating stench. There were thousands of frantic calls to emergency services, from Normandy to Paris, with residents describing the smell of household gas or rotten eggs, but the authorities moved quickly to calm fears. The cloud, officials said, was one of a group of substances called mercaptans, foul-smelling but largelyharmless...