13/05/1888 Danish seismologist Inge Lehmann is born
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The Mystery of the Earth's Core Explained
Lehmann discovered that the Earth has a solid inner core inside a molten outer core. Before that, seismologists believed Earth's core to be a single sphere. They were, however, unable to explain measurements of seismic waves from earthquakes, which were inconsistent with this idea. Lehmann’s theory solved the problem.
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