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Joe Biden is mourning as the 46th president of the United States. In his acceptance speech,Biden promises to bring unity to the nation. People in Beijing and other northern Chinese cities are being tested after an increase in the number of Covid-19 cases in the area. Russia says it wants to extend a new start nuclear arms control treaty with the United States. And the Covid-19 vaccine by Pfizer and BioNTech is likely to protect against a new version of the coronavirus that has spread from Britain,researcher suggests.