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Word: themass (lookup in dictionary) (lookup stats)
Dates: during 1980-1989
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Usage:

...This is important because we don't know themass of the neutrino, one of the essentialelementary particles. If there were no neutrinos,there would be no sun and no Earth," Glashow said...

Author: By Benjamin R. Miller, | Title: Astronomers Observe Supernova | 4/11/1987 | See Source »

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