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World Service,25 Sep 2021,9 mins

Has the number of periods a woman has in her lifetime quadrupled?

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Has the number of periods a woman has, on average, in her lifetime quadrupled since the industrial revolution? A recent article estimated that 129 billion single-use face masks are used every day around the world. It sounds wrong, but how wrong is it? And how did it get so wrong? (Image credit: Isabel Pavia/Getty images)

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