Word: pit
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Dates: during 1940-1949
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...good luck. Had it happened, every building in New York City and every ship at its docks-not to mention its people-would have vanished without a trace. A crater would have been blown in the earth 100 miles across, and the sea would have poured into this vast pit from southern Connecticut halfway to Philadelphia. Cause of this might-have-been catastrophe: some well-intentioned physicists at Columbia University who were cracking uranium atoms with neutrons as contentedly as small boys crack nuts...
Taking a lesson from Oakley, the U. S. Public Health Service for years sent warnings to 300 other "mottled enamel areas" from South Carolina to Oregon. Even one-millionth part of fluorine in four daily glasses of water over a period of a year, said dentists, was enough to pit a growing child's teeth for life. And fluorine-pitted teeth, all dentists believed, quickly decayed and fell...
...tooth powder or paste should not be considered, because it is unsafe. Fluorine is poisonous and dangerous if administered by untrained persons." He assured his colleagues that they need not sacrifice beauty for utility. Fluorine, he said, mottles only newly erupted second teeth. In proper doses, it will not pit permanent teeth if given after...