Demonstrators participate in the March for Science in Washington D.C., the United States, on April 22, 2017. Tens of thousands of people attended the march in U.S. capital on Saturday. Tens of thousands of scientists and their supporters took to the streets in Washington, D.C. and around the world on Saturday to protest against what organizers described as an "alarming" anti-science trend. (Xinhua/Yin Bogu)
