I just celebrated another happy birthday. I was a lucky kid, born in an American hospital with all the trained staff and technologies available at that time. Which is why a headline on my birthday struck me as a pretty wonderful present, “Africa may soon be polio-free.” Polio seems like a distant plague to us, but the last known case of polio in the U.S. was only in 1979. The same year we watched the Iran hostage crisis unfold, ESPN was launched, and McDonald’s introduced its Happy Meal.

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