Building immunity is not simply a matter of having the right antibiotics or vaccines at hand, although these can certainly help. It is also about fostering the core strength to resist assault or recover quickly if one occurs. In that sense, the body’s ability to fight infection and a community’s capacity to sustain itself in the face of violence or natural disasters are primed in much the same way. The science of resilience tells us that the right prescription can influence how we deal with stress, combat microbes, avoid Alzheimer’s disease, and confront personal and collective trauma. What tools are best for bolstering immunity and making a rebound possible?