How Inge Lehmann used earthquakes to discover the Earth's inner core - 1 views
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nestamper on 13 May 15In the 1930s, seismologists faced a big mystery about the inner structure of the Earth. Today, on what would have been Danish seismologist Inge Lehmann's 127th birthday, it's a good time to appreciate how - using limited data and rudimentary technology - she brilliantly arrived at the answer.