Dec 30th 2013, 23:00, by Ashley Feinberg
Back in 2007, scientists found evidence of our planet's first continents in the form of 4.3 billion-year-old diamonds—old as the very Earth itself. And these diamonds were finally going to give us the insight into the evolution of Earth's crust that we've been searching for. Now, six years later, there's just one little problem: Those tiny gems? Actually tiny leftover bits of polishing grit. Whoops.
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