23/01/1957 Croatian meteorologist and seismologist Andrija Mohorovičić is born
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He is best known for the eponymous Mohorovičić discontinuity. It is a boundary between the Earth's crust and the mantle. Mohorovičić discovered it, when he observed seismograms from shallow-focus earthquakes had two sets of waves, one that followed a direct path near the Earth's surface and the other refracted by a high-velocity medium.