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Scientists are probing the secrets of Earth’s inner core—and how it saved life on our planet -

Armed with complex models and waves from nuclear tests, researchers are revealing the Pluto-size world beneath our

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“The inner core is a planet within a planet. … It’s beneath our feet and yet we still don’t understand some big questions.” #WeekendReads https://t.co/bKocUEs840 https://t.co/bKocUEs840 - view on twitter

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