Epidemiologist and Dean of the Harvard T. H. Chan School of Public Health Michelle Williams suggests corporations may be the key to stemming Covid’s spread and ensuring a safe fall semester for students and teachers. Bruce Feiler, author of “Life Is in the Transitions: Mastering Change at Any Age,” offers insight on navigating the personal and professional changes prompted by the coronavirus pandemic. Plus, Elon Musk and Jeff Bezos are each over $10 billion wealthier today than they were yesterday, and the NFL is shelling out $75 million for daily Covid testing during practice camps.