You probably have to be Jewish to appreciate the full and bitter irony of this sentence: Nearly 11 months into a devastating war, a serious new challenge has emerged in Gaza: polio. Growing up, there were two uncontested heroes in the Jewish-American pantheon: Sandy Koufax and Jonas Salk. If you were really in the know, you’d add a third: Albert Sabin. Salk invented the polio vaccine, Sabin invented the oral polio vaccine. Now Israel has contributed an entirely new entry to the history of polio. It almost reads like a fable from Jewish literature. Except it’s not.