When physicians choose radiation to battle cancer and cancerous tumors, they are fighting not just in three dimensions but four, the dimension of time.  In a recent podcast for Operations Research: The Science of Better, which aired on Friday, April 30, 2010, Eva K. Lee, associate professor in the H. Milton Stewart School of Industrial and Systems Engineering and director of the Center for Operations Research in Medicine and HealthCare at Georgia Tech spoke with host Barry List about how physicians must take into account not only the shape and size of the cancer, but also the dimension of time in modeling treatment. In the podcast, Lee explains how her operations research innovations have helped create treatment plans that do a better job healing patients, avoiding radiation damage to healthy tissue, and saving a half billion dollars in related healthcare costs. She also reflects on improved homeland security modeling for biological events ranging from the outbreak of the H1N1 flu outbreak to bio-terror attacks. Click here to hear the podcast.