The US health-care system tends to invest in treating diseases, not preventing them, even though science shows it is cheaper and more effective to treat the lifestyle or behavioral facts that lead to a disease, rather than try to treat the disease after it develops. That could start to change under the leadership of Nadine Burke Harris, California’s new surgeon general. Harris is ultimately the one who discovered that the strong correlation between a child’s exposure to trauma and their likelihood of developing certain diseases in adulthood. With her at the helm, there’s hope for change.