Earthquakes, volcanic eruptions, tsunamis and tidal waves, fires, mine cave-ins, bridge collapses, ship sinkings, plane crashes, explosions, and plagues -- natural and human-engineered calamity and catastrophe have many forms and guises. In Now You Know Disasters, Q & A ringmaster Doug Lennox showcases the what, why, when, where, who, and how of everything that's gone tragically and terribly wrong, past and present. How does a tsunami occur? Why do Canadian engineers wear iron rings? Who was Richter in the Richter scale? What was the worst freshwater ship disaster ever in North America? What is wildfire? Who was Typhoid Mary? How is "ring around the rosie" related to disaster? How did the Halifax Explosion occur? What was the world's worst aeroplane crash?