My grandmother escaped the Warsaw ghetto after her first of four sisters died from hunger. She slipped through a few missing bricks in the wall that sealed the Jewish population away from their Aryan neighbors, where they were trapped in poverty and malnourishment and subject to Nazi plans for extermination. Scholars report that 92,000 Jews died of starvation in the ghetto before 300,000 were deported to camps. After escaping, my grandmother — just a teenager — snuck food to her family several times before the rest of her family died, and my grandmother stayed hungry for many years, as she...