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Published online 21 October 2005 | Nature | doi:10.1038/news051017-16
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Pollution makes for more girls
The stress of dirty air skews sex ratios in Sao Paulo.
Toxic fumes favour the fairer sex, a group of researchers in Brazil has found.
Jorge Hallak and his team at the University of Sao Paulo turned up the surprising result by studying babies born in their city.
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