The cancer is aggressive, typically spreading to other organs in the body before the patient is even aware he has it, and it usually strikes men age 30 and younger.

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"What's different about them is that spreading ridges on the Earth typically spread symmetrically about a rift, " he said.

BBC: Enceladus has 'spreading surface'

One way he does it is by spreading his bets: at any given time, the Pure Alpha fund typically has in place about thirty or forty different trades.

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