The disastrous earthquake last May changed the lives of thousands and thousands of people in my hometown province of Sichuan in Western China. The aftereffect is still tremoring in my saddest memories. But why is earthquake so difficult to predict? Why hasn’t science worked out how to predict when and where the next big quake is going to happen? BBC horizon takes us to a journey to Sichuan and California, telling us the story of the men and women who chase earthquakes and try to understand this mysterious force of nature.
Watch the program here.