Mercury in perspective

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Digg 29 Mar, 2012

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Source: http://digg.com/news/story/mercury_in_perspective?utm_campaign=Feed%3A+http%3A%2F%2Fservices.digg.com%2F2.0%2Fstory.getTopNews%3Ftype%3Drss&utm_medium=feed&utm_source=diggapi
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