When it comes to natural disasters, such as tornadoes, hurricanes, earthquakes and volcanoes, exactly what does it take to make sure everyone heeds the warning signals, and takes immediate and appropriate action? To cite the recent example of the tsunami that swept over the northern part of Japan in the wake of a 9.0 earthquake, even dire warnings of impending devastation that date back centuries apparently aren't enough to prompt people to take the necessary precautions in the event of a natural disaster.