What does science tell us about boxing’s gender row?

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A frenzied debate has raged over the International Olympic Committee clearing the Algerian boxer Imane Khelif and Taiwan’s Lin Yu-ting to compete in the women's boxing in Paris, despite them having been disqualified from last year's Women's World Championships for failing to meet eligibility criteria. Sofia Bettiza, the BBC's Gender and Identity correspondent, takes us through what science tells us about boxing's gender row. (Image: BBC)