Blue-collar workers have 50% higher sperm counts than their peers, Harvard study indicates https://www.dailymail.co.uk/health/article-11786181/Blue-collar-workers-50-higher-sperm-counts-peers-Harvard-study-indicates.html https://academic.oup.com/humrep/advance-article/doi/10.1093/humrep/dead027/7034534?utm_source=authortollfreelink&utm_campaign=humrep&utm_medium=email&guestAccessKey=87e840cd-75fb-4975-8010-b2705f827fbb&login=false#395491854