You don’t hear about it much these days, but polio ravaged the world for decades. It prompted summer lockdowns in the US and paralyzed millions of people around the world. Enter the Global Polio Eradication Initiative. Considered the single largest internationally coordinated public health project in history, it launched in 1988 and continues today. The World’s Elana Gordon reports on how the lessons learned from this massive effort are now being applied to COVID-19.