How the biological clock is ticking for men as well as women
New studies show sperm becomes less fertile after men reach 35, while the risk of passing on genetic mutations rises. Ana Swanson reports on a thought-provoking threat to male complacency
New studies show sperm becomes less fertile after men reach 35, while the risk of passing on genetic mutations rises. Ana Swanson reports on a thought-provoking threat to male complacency