Teaching robots right from wrong

More than 400 years ago, according to legend, a rabbi knelt by the banks of the Vltava river in what is now known as the Czech Republic. He pulled handfuls of clay out of the water and carefully patted them into the shape of a man. The Jews of Prague, falsely accused of using the blood of Christians in their rituals, were under attack. The rabbi, Judah Loew ben Bezalel, decided that his community needed a protector stronger than any human. He inscribed the Hebrew word for "truth", emet, onto his creation's forehead and placed a capsule inscribed with a Kabbalistic formula into its mouth. The creature sprang to life.