Having dropped (back in 1990) a plan to build the world's biggest ice-breaker, the Canadians may also have to seek Russian help next time they need to carve out a path to the North Pole: even the patrol boats ordered up by Mr Harper this month won't match Russia's leviathans.

ECONOMIST: The Arctic

Breaker Brett Gardner, meanwhile, managed just one hit over the same time frame.

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The NYSE has a circuit breaker in place, so the exchange shut off trading for a period of time to quell panic.

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