After more than three very long years, it's finally happening: The Covid-19 pandemic is ending, at least in the formal sense, both in this country and abroad. This moment is not being marked with parades or big parties but rather with the flourishes of two administrative pens. On Friday, the World Health Organization announced that Covid-19 no longer constitutes a Public Health Emergency of International Concern, and this Thursday, the United States is set to end its own public health emergency declaration.