A new study shows that urban dwellers might be at a greater risk for breast cancer than their rural counterparts. Researchers at the the London Breast Institute found that women who lived in London had "significantly denser breasts than those living outside the city," says Science Daily. Women with dense breasts as opposed to fatty breasts are four times more likely to develop breast cancer. The head of the London Breast Institute, Dr. Nicholas M. Perry, stresses the importance of regular mammograms for all women regardless of geographical location. [Science Daily]