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What if you recorded a sporting event and someone told you the final score? Would you still watch it? Probably not because it’s the uncertainty of the outcome that keeps your attention.
Source：Super Trader http://www.amazon.com/gp/product/0071608443?ie=UTF8&tag=a0b8a8-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=0071608443
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