...fathers who reported spending at least three hours a day with their kids had even lower testosterone levels than other dads, the researchers reported in the Proceedings of the National Academy of Sciences.
"Humans give birth to incredibly dependent infants," Northwestern University anthropologist Lee Gettler, a co-author of the study, told the New York Times. "Historically, the idea that men were out clubbing large animals and women were staying behind with babies has been largely discredited. The only way mothers could have highly needy offspring every couple of years is if they were getting help."
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