What Carried The Girls Away

This is interesting science:

" . . . , Oster began searching for data on hepatitis B and sex ratios. She found that among Alaska natives in the 1970's, there were both a high rate of hepatitis B and an overwhelming number of boys born. With the help of statisticians, she confirmed that when the hepatitis B vaccination became available in Alaska in the early 80's, the gender balance was restored. "

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