Scientists now say they know the simplest material for DIY face masks. 科学家们表示，现在他们已经知道了DIY口罩的最佳材料。 The coronavirus pandemic has prompted a heated debate over the efficacy of…
New research suggests that grocery stores and universities should reopen first 新的研究表明，杂货店和大学应该首先重新开放 New research suggests that grocery stores, banks, schools, learning centres, dentists, universities, and…