What a 4.4-billion-year-old crystal looks like http://arstechnica.com/science/2014/02/the-oldest-piece-of-the-earth-examined-atom-by-atom/ …
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What a 4.4-billion-year-old crystal looks like http://arstechnica.com/science/2014/02/the-oldest-piece-of-the-earth-examined-atom-by-atom/ …