Tsunamis, earthquakes, monsoon floods, bird flu, international terrorism - life seems to get more dangerous by the day. Or does it ? Disaster historian John Withington has made a study of the worst things that have happened on earth from the dawn of time to the resent day. The natural catastrophes - earthquakes, storms, floods, famines and diseases. The accidents - fires, explosions, shipwrecks, air and train crashes. And the disasters created deliberately by man - wars, invasions, massacres, riots and terrorism.