Word: occurs
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Dates: during 1930-1939
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...shells of hot gas, increases greatly in brightness. Ordinary novae attain a maximum brightness about 25,000 times that of the sun. Therefore, since the difference between actual brightness and apparent brightness depends on distance, novae have provided important clues to the distances of the nebulae in which they occur. About 130 novae have been recorded-most of them found by chance on photographic plates...
...approximately one-half of her children. Her brothers and sisters who have similar ears will do likewise. Those who have normal ears will have children with normal ears and in succeeding generations the defect will not recur." This was significant because such malformations as polydactyly (extra fingers) often occur on only one hand, sometimes skip a generation...
This accident at landing was one which would not ordinarily occur and which can easily be prevented in the future by using rock-wool instead of excelsior...
...sentence in the Constitution which says: "The President shall have power to fill up all vacancies that may happen during the recess of the Senate, by granting commissions which shall expire at the end of their next session." The present vacancy did not "happen" (in the sense of "occur") during a recess of the Senate but it will "happen" (in the sense of "happen to exist") during a recess if the President waits until after Congress adjourns. Franklin Roosevelt gave the press to understand that his Attorney General espoused the latter view, but gave no hint of his intended action...
Since few orthodox Communists believe in life after death or in redemption from sin by God's mercy, the nearest thing to these offered by the Soviet State occur on such solemn yet joyous occasions as last week filled Moscow's Bolshoi Theatre...