Operation LAC (Large Area Coverage), was a U.S. Army Chemical Corps operation which dispersed microscopic zinc cadmium sulfide (ZnCdS) particles over much of the United States. The purpose was to determine the dispersion and geographic range of biological or chemical agents.
Read more about Operation LAC: Earlier Tests, Operation, Specific Tests, Scope, Risks and Issues, See Also
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“Human knowledge and human power meet in one; for where the cause is not known the effect cannot be produced. Nature to be commanded must be obeyed; and that which in contemplation is as the cause is in operation as the rule.”
—Francis Bacon (1560–1626)