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Levels of disease in the environment may be linked to gains in women's political power. That's the finding of two psychologists who pored over six decades of data, looking at connections between ecological stressors and gender equality. Arizona State - Tempe's Michael E. W. Varnum and University of Waterloo, Canada's Igor Grossmann found that declining infectious disease rates in the US were strongly correlated with a rise in gender equality. The big question is why. Writing in Nature Human Behavior, the researchers say the trend can be partly explained by looking at how pathogens "cue people to adopt faster life strategies."
