In 1954, 1.3 million kids participated in a nationwide test that helped end one of the 20th century’s scariest threats.
When the U.S. Food and Drug Administration authorized the use of Pfizer and Moderna’s COVID-19 vaccines last December—a year after the coronavirus was first identified in Wuhan, China—it was a dramatic piece of good news after one of the most disruptive years the country has ever experienced.