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States are reopening. Parks are crowded. Restaurants are filling, again, with diners. But is this dangerous? Six months into the pandemic, we reflect on what we\u2019ve learned about the virus \u2014 and ask how that knowledge should chart the course forward. Guest: Donald G. McNeil Jr., a science and health reporter for The New York Times. For more information on today\u2019s episode, visit nytimes.com/thedaily\xa0\n\nBackground reading:\xa0As New York businesses reopened, Gov. Andrew Cuomo warned that a second wave of infections was almost inevitable if residents did not abide by social-distancing rules. \u201cIt will come,\u201d he said. \u201cAnd once it comes, it\u2019s too late.\u201d\xa0Restrictions are easing across the United States, but Arizona, Florida and Texas are reporting their highest case numbers yet. As of Saturday, coronavirus cases were climbing in 22 states.