After hours of careful thought, the Yeshiva administration posted a hand-lettered sign outside the cafeteria door.THE YESHIVA PROVIDES FOOD FOR ONE PORTION ONLYNO STUDENT IS PERMITTED TO STAND IN LINE FOR SECOND PORTIONBy the time I finished lunch, I noticed that some student had altered the sign in a subtle, Talmudic manner: THE YESHIVA PROVIDES FOOD FOR ONE PORTION ONLY?NO STUDENT IS PERMITTED TO STAND IN LINE FOR SECOND PORTION.The Sea of Talmud...