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demographic- How many babies were born with blue eyes in 1999?
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Socil history- why does a traditional family normally have two children?
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Demographic- What is the Divorce rate of couples in the year 2009? Social History- When did Divorce become more socially exceptable and was no longer considered a taboo?
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demographic- how many people attended the Green Day's 99 revolutions tour in 2012
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Intellectual history- How has improvment in car saftey features helped people drive safer in 2015
