![750,000-year-old ice cubes](http://www.newscientist.com/data/images/ns/cms/dn16323/dn16323-1_300.jpg)
750,000-year-old ice cubes
They may look like long-lost objects from a distant high-tech civilisation, but these large black objects buried in the Canadian Arctic are huge chunks of ice - the oldest ice ever found in North America. Researchers say the discovery could help predict the fate of the deep Arctic permafrost.
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