Egoism, Machiavellianism, narcissism, psychopathy, sadism, spitefulness are all traits that stand for the malevolent dark sides of human personality. Results from a recent project show, these traits share a common 'dark core.' So, if you have one of these tendencies, you are also likely to have one or more of the others.
from Top Health News -- ScienceDaily https://ift.tt/2OZjPpi
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