Contrary to overall cancer trends, there's been an increase in certain cancer diagnoses in people under 50. From 2010 through 2019, the incidence of 14 cancer types increased among people in this demographic. The big question is, why? Does it have to do with lifestyle choices? Are there environmental factors at play? What can be done to mitigate risk? Welcome to "Harvard Thinking," a podcast where the life of the mind meets everyday life.