World Insights: U.S. COVID-19 deaths surpass 500,000 as virus variants pose new threats

Photo taken on Feb. 22, 2021 shows the Washington Monument in Washington, D.C., the United States. The United States reached the grim milestone of half a million coronavirus deaths on Monday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. (Xinhua/Liu Jie)