It was displayed in a high-security cabinet which was smashed with a drain cover on May 12 last year.

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The second suggests that a rod-like plug can block the hole by slipping across it sideways and stopping large ions from passing, rather like a drain cover stops leaves from entering the mouth of a pipe.

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So when conditions, like the ones Europe has just experienced, occur, big money will run for cover whenever possible and this will drain money from equities and cause a big downdraft and make for a correction.

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