Countries continue to have varying responses to the Covid-19 pandemic, with widely different outcomes in the number of confirmed cases and deaths as a result of the virus. A country’s actions, or lack of action, in responding to the pandemic is partly informed by models that predict the virus’ impact on various aspects of society. But Olivier de Weck, professor of aeronautics and astronautics and engineering systems at MIT, says that most of these models are short-sighted. He and experts from countries with wide-ranging responses to the pandemic have a…