Every batch of sperm represents an opportunity for genetic typos...

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Every batch of sperm represents an opportunity for genetic typos – called de novo mutations – to be passed on. A 20-year-old man and woman will each pass on about 20 de novo mutations to a baby they conceive. By the time the couple is 40, a woman’s total has remained at 20, while a man’s has jumped to 65 – and it keeps climbing from there.

Jeffrey Kluger