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Our species is long–lived compared with other primates. Chimpanzees, for instance, have a life expectancy of about 13 years versus 78.5 years for U.S. babies born in 2009 (Pringle 2013). Why such a big gap? Pringle says vaccines, antibiotics, sanitation, and access to nutritious vegetables and fruits year round give us a huge edge over our great–ape cousins, as does our acquired ability to fight off pathogens and irritants in our environments.
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