At the Passover seder this week, we got to the part where the tenth plague happened. All of the Egyptian firstborn had been slain, and the Pharaoh relented (at least temporarily) and agreed to let the Jewish slaves depart.
And then the youngest child at our seder had a question. “Why,” he asked, “if all the Egyptian firstborn were killed, isn’t the Pharaoh dead?”
Nobody at the table knew the answer. I, for one, thought it was a very good question.