Two years ago on Friday, the world officially entered a pandemic. In just a matter of weeks after the first COVID-19 cases were detected in China, the coronavirus had reached more than 100 different nations. Since then, SARS-CoV-2 has made its way to every corner of the globe. The World’s Elana Gordon reports on some of the lessons we’ve learned over the past two years, and why the virus is still not going away.