modern people, in spite of their scientific knowledge, often seem as superstitious as their ancestors. astrology is a half-billion-dollar business. intelligent person still believe that lines on their palm or the arrangement of tea leaves in a cup predict the future. airplanes do not have a row of seats numbered 13, and buildings omit a thirteenth floor. black cats, broken mirrors and spilled salt create fear and anxiety in many people. and ouija boards continue to be a popular pastime.