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CORAL GABLES, FL—Noting how excited participants were even just to wait in line until it was their turn, a new study published by researchers at the University of Miami found that scanning items at a supermarket self-checkout was even…

Merriam-Webster defines a psychopath as “a mentally unstable person.” “Especially,” the online dictionary elaborates, “a person having an egocentric and antisocial personality marked by a lack of remorse for one’s actions, an absence of…