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The Conversation: How a wobbly axis helped our planet escape 'snowball Earth http://www.birmingham.ac.uk/news-archive/2015/the-conversation-how-a-wobbly-axis-helped-our-planet-escape-snowball-earth
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The Conversation: How a wobbly axis helped our planet escape 'snowball Earth http://www.birmingham.ac.uk/news-archive/2015/the-conversation-how-a-wobbly-axis-helped-our-planet-escape-snowball-earth
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