More than 60 percent. That’s how much sperm counts have declined worldwide over the past decades. By the time they reach the age of 20, young men have “a much lower sperm count than their fathers at the age of 50,” says Dr. Hagai Levine, head of environmental health at the Hadassah-Hebrew University Braun School of Public Health and Community Medicine, who has a new study on the subject. In this episode of Hadassah On Call, you’ll hear what’s contributed to this drastic drop, which can impact fertility -- including negative exposures in the womb.