after sanitation, the greatest predictor of improved life expectancy is access to universal healthcare, including child vaccination.4 And once you have these basic interventions in place, the biggest single driver of continued improvements in life expectancy happens to be education – and particularly women’s education. The more you learn, the longer you live.5 Don’t get me wrong. It’s true that nations with higher income tend in general to have better life expectancies than nations with lower income. But there is no causal relationship between these two variables. ‘The historical record is
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