Word: quadruplets
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Dates: during 1930-1939
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...Rule of 87: One twin birth occurs to approximately 87 single births; one triplet to about 7,569 singles (87 squared); one quadruplet to about 658,503 singles (87 cubed); one quintuplet to about 57 million singles (87 to fourth power); one sextuplet to about five billion singles (87 to fifth power...
...births, if the "Rule of 87" holds out. W. W. Greulich, University of Colorado statistician, after examining tables of over 100,000,000 births in various countries, found that one twin birth occurs to approximately 87 single births, one triplet to about 7,569 (87 squared) singles, one quadruplet to about 658,503 (87 cubed) singles. Fifth power of 87 (for sextuplets) is about five billions. No one has been able to explain this apparent rule...
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