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RIO DE JANEIRO, BRAZIL - A group of Australian researchers claim to have finally solved the mystery: it's not about the gender, but rather about the chromosomes.

According to a study published on Wednesday, March 11th, by the scientific journal Biology Letters, and disclosed by BBC News, having two copies of the same chromosome is associated with a longer life, suggesting that the second copy provides a kind of protective effect.

All cells contain . . .

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