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N49: Stellar Shrapnel Seen in Aftermath of Explosion The aftermath of a supernova explosion in the Large Magellanic Cloud.
In the 1940s, the Dutch psychologist Adrian de Groot performed a landmark study of chess experts. Although de Groot was an avid chess amateur – he belonged to several clubs - he grew increasingly frustrated by his inability to compete with more talented players. De Groot wanted to understand his defeats, to identify the mental skills that he was missing.
Complete relationship chart between psychological ("personality") types