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CNN’s Wonder Theory science newsletter offers updates on scientific discoveries and advancements. Researchers are intrigued by Earth’s inner core, a solid metal ball rotating independently of the planet. Discovered by Inge Lehmann in 1936, its rotation speed and direction have been debated for decades. Recent evidence suggests dramatic changes in its spin, but scientists remain divided. Seismologists study earthquake waves to understand the core’s motion, with significant findings emerging since the 1990s. Dr. Lauren Waszek highlights the historical context of this research.

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