The Harvard School of Public Health and Brigham and Women’s Hospital recently announced that the Nurses' Health Study (NHS) is growing. Begun in 1970's, NHS has provided important information about health and disease from 238,000 nurse participants. NHS3 is looking for 100,000 participants to form a new, diverse cohort of female RNs, LPNs, or nursing students who are between the ages of 20 and 46 from across the US and Canada.