In 2009, an influential panel of medical experts ignited a controversy when they recommended that most women should not begin routine mammograms to screen for breast cancer until the age of fifty, reversing guidelines they had issued just seven years before when they recommended forty as the optimal age to start getting mammograms. While some praised the new recommendation as sensible given the smaller benefit women under fifty derive from mammography, many women's groups, health care advocates, and individual women saw the guidelines as privileging financial considerations over women's...