Whether you are child in Baltimore, Beijing, Nairobi or New Delhi, the onset of adolescence triggers a surprisingly common set of rigidly enforced gender expectations that are linked to increased lifelong risks of everything from HIV and depression to violence and suicide. That’s the key finding from a groundbreaking 15-country study released today by the Global Early Adolescent Study, a collaboration between the Johns Hopkins Bloomberg School of Public Health and the World Health Organization (WHO) as a collection of articles in the Journal of Adolescent Health.