Threats to lifelong mental health can arise for young children from sources including poverty, abuse or neglect at home, and racism, inequity, and pollution outside their doors, but the hopeful message that a range of experts brought to MIT on May 11 was that amid these many risks, approaches to provide effective protections and remedies are numerous and growing. In welcoming and closing remarks that framed The Picower Institute for Learning and Memory’s daylong symposium, “Environmental and Social Determinants of Child Mental Health,” director and MIT Picower Professor Li-Huei Tsai…