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The article focuses on a paper published in the October 2014 issue of the periodical "Science," by researchers Oliver Pybus and Philippe Lemey, on the dissemination of the HIV virus. Topics include the mutation of the HIV-1 chimpanzee virus, the HIV virus's origination in Kinshasa, Democratic Republic of Congo (DRC) in the 1920s, and the rate of human infection between the 1960s and 2014.

The article discusses a paper by Vincent Bignon of the Bank of France and Cecilia García-Peñalosa of the Aix-Marseille School of Economics on the impact on the demography of France of the late-19th-century Méline protectionist tariff on grain with a focus on the alleged reduction in human capital and education caused thereby.