During the Omer, Rebbe Akiva's 24,000 students died because they didn't properly respect one another. We still mourn them, almost 2,000 later, because we haven't yet corrected their sin. We're all still guilty of intramural hate. Do you know why? We haven't yet learned the lesson of the Four Sons on Seder night. Let me explain, with an amazing story from sixty years ago, about my father, of blessed memory...