This explains why so little is known about the relationship between religious involvement and severe mental disorders see handbook of religion and health despite the negative views and opinions held by many mental health professionals research examining religion spirituality and health has been rapidly expanding and most of it is occurring outside the field of psychiatry. This explains how people could cooperate in groups larger than 150 giving them a military and security advantage and encouraging specialization which eventually gave them a technological advantage moreover harari claims assumes all these later sapiens were genetically identical and that the variations in societies are purely cultural ie inter subjective realities
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