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John Bidne 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 of the number of covid-19 cases in the area.

Russia says it wants to extend the new start nuclear arms controlled treaty with the United States.

And the covid-19 vaccine by  ** is likely to attack against the new version of the coronavirus that has spread from Britain, research suggests.