"The coronavirus has transformed everyday life so significantly that the effects are already visible from space. In China, where hundreds of millions of people were quarantined to help stop the spread of the disease, before-and-after satellite photos show pollution disappearing as work came to a standstill. In the U.S., as the number of coronavirus cases has grown quickly, companies are asking employees to work from home and canceling conferences. Schools are canceling classes. In Italy, another massive quarantine is underway. The changes have been sudden, driven by widespread recognition that it’s a public health emergency—and, although the window of opportunity may have already closed, a chance to prevent another deadly disease like the flu from becoming a permanent, ongoing problem."