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Many people around the world now wear masks, covers for their nose and mouth, when they go out in public. You see masks on people walking their dogs, buying food, riding bicycles and working at their jobs.In many places the masks are required by law

Conventional knowledge has it that warm air rises while cold air sinks. But a study from the University of California, Davis, found that in the tropical atmosphere, cold air rises due to an overlooked effect -- the lightness of water vapor. This effe

Former President Barack Obama gave a commencement address to the nation’s high school seniors.阅读奥巴马高中毕业典礼演讲全文前总统巴拉克·奥巴马向全国高三学生发表毕业典礼演讲。Former President Barack Obama spoke Saturday at “Graduate Together: High School Class of 2020 Commencement,” an eve

Two studies show that museums are another part of the world economy that has been greatly weakened by the coronavirus pandemic.The studies report that 90 percent of museums worldwide have been forced to close and stop in-person operations during the

Food banks in the United States have struggled to meet increasing demand from people who cannot pay for food because they have lost their jobs. At the same time, farmers cannot sell much of their crop food, so many vegetables and meat from farm anima