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Last century, earthquakes killed over one million, and it is predicted that this century might see ten times as many deaths. Yet when an earthquake strikes, it always takes people by surprise. So why hasn't science worked out how to predict when and where the next big quake is going to happen? This is the story of the men and women who chase earthquakes and try to understand this mysterious force of nature. Journeying to China's Sichuan Province, which still lies devastated by the earthquake that struck in May 2008, as well as the notorious San Andreas Fault in California, Horizon asks why science has so far fallen short of answering this fundamental question.

Other episodes for this season

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Episode 1 - Why Are Thin People Not F...
Cannabis: The Evil Weed?
Episode 2 - Cannabis: The Evil Weed?
Why Do We Dream?
Episode 3 - Why Do We Dream?
Can We Make a Star on Earth?
Episode 4 - Can We Make a Star on Ear...
The Secret Life of Your Bodyclock
Episode 5 - The Secret Life of Your B...
What's the Problem with Nudity?
Episode 6 - What's the Problem with N...
How to Survive a Disaster
Episode 7 - How to Survive a Disaster
Who Do You Want Your Child to Be?
Episode 8 - Who Do You Want Your Chil...
Why Can't We Predict Earthquakes?
Episode 9 - Why Can't We Predict Earthquakes?
Alan and Marcus Go Forth and Multiply
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How Violent Are You?
Episode 11 - How Violent Are You?