Word: microgram
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Dates: during 1945-1945
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...colleagues, "one of the world's greatest geniuses, no question about it." The Stretch. When, in March 1941, the process was discovered for manufacturing the atomic explosive, chemists feared it would take years to perfect a method of making it in quantity. Measurements accurate to 3% of one microgram (about one two-millionth the weight of a human breath) had to be established...