The Food and Drug Administration on Tuesday issued an emergency authorization for the country’s first coronavirus test that can run from start to finish at home without the need for a prescription. People as young as 2 years old are cleared to use the test, which takes just 15 to 20 minutes to deliver a result. Unlike many similar products, which are only supposed to be used by people with symptoms of Covid-19, this test is authorized for people with or without symptoms. To read the full story.