The Seeker.com article Earth's Inner Core Has Its Own Inner Core states that

researchers at University of Illinois and Nanjing University in China have made a bizarre discovery. They've found that the Earth's inner core has an inner core of its own, like a Russian nesting doll, that has different properties from what scientists have previously imagined

Is it possible that there could be three cores?

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    $\begingroup$ Is it possible? Absolutely. There's a lot we don't know about Earth's core. There might be a 4th layer, quite small, made up of Platinum, Gold and other dense metals. discovermagazine.com/2006/sep/innerfortknox $\endgroup$ – userLTK Apr 18 '17 at 21:07
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    $\begingroup$ Cool! I guess it makes perfect sense for earth to have more then two or three cores/layers. Thanks😃 $\endgroup$ – Wiz Kid Apr 20 '17 at 2:30

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