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Researchers into longevity and genetics drastically scale back their estimate of lifespan heritability from 15-30% to 7%. arstechnica.com/science/2018/11/genetics-play-less-of-a-role-in-lifespan-than-we-thought/
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Adjustment was necessary b/c couples, in-laws, and others related by marriage have correlated lifespans, likely due to shared life conditions and assortative mating.