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Is it safe to go back to school yet? As the coronavirus has waned and then surged again in the U.S., this has been one of the biggest questions on the minds of parents, teachers and students. It’s also an incredibly tricky question to answer. I asked Derek Cummings, an expert in infectious disease transmission at University of Florida’s Emerging Pathogens Institute, and Emily Oster, economics professor at Brown University, about the risks and challenges that lie ahead.