CHICAGO - (KRT) - One imagines the Persian queen smiling warmly as she passes the food down the table to her daughter-in-law. Queen Parysatis, during the reign of her son, Artaxerxes II (405 to 359 B.C.), was trying to influence a power struggle within the kingdom and had felt the need to be rid of her daughter-in-law. She poisoned one side of a knife that then was used to bisect a roast bird at dinner. Taking the untainted half for herself, she passed the rest, knowing - hence the smile - that her problem was all but solved. Recorded instances...