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The social brain hypothesis predicts that humans have an average of about 150 relationships at any given time. Within this 150, there are layers of friends of an ego, where the number of friends in a layer increases as the emotional closeness decreases. Here we analyse a mobile phone dataset, firstly, to ascertain whether layers of friends can be identified based on call frequency. We then apply different...
Sigismund Schlomo Freud was born in Freiberg, Moravia (now Pribor, Czechoslovakia) on May 5, 1856. He began using the shortened “Sigmund” after entering the University of Vienna in 1873 at age 17. Freud’s Hasidic Jewish family history was complicated by early deaths and frequent remarriages, common at the time. Freud’s father, Jacob, a poor wool merchant, married Amalia Nathanson, when he was 40 and...
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