The city of London sweltered in the heat of summer, 1858. But it was not merely the sun that baked the metropolis. An even more unpleasant force infested its very heart: the River Thames. Years of industrial effluents had transformed London's lifeblood into a nauseating odor. The stench was all-consuming, a miasma that clung to every cobblestone an

One sunny/bright/clear afternoon in 1587, a small colony/115 settlers/a group of adventurers on Roanoke Island vanished without a trace/clue/whisper. This event, known as the Lost Colony of Roanoke, has haunted/baffled/puzzled historians and amateur sleuths/investigators/enthusiaists for centuries/generations/decades. Despite/In spite of countless