They're thinking pink at North State Imaging in Chico. The fourth annual Operation Mammogram was in full force today and dozens of women lined up for free mammogram screening. It was available to women who met certain criteria like being over age 40 and uninsured. The women began lining up around eight this morning. It's estimated that 1 in 8 women will develop breast cancer in their lifetime, which is why getting a mammogram is so important.