A study published in the Journal of Research in Personality revealed some interesting information. It concluded that intelligent people are more likely to be generous and altruistic. While generosity is not something people usually associate with intelligence, this research clearly shows a link. In the study abstract, the researchers referred to “unconditional altruism” as an enduring puzzle and posited that the “costly signaling theory,” a well-established framework in biology and economics, may be useful to shed light on the individual differences in human unconditional altruism. Based on this theory, their research showed that unconditional altruistic behavior is related to general intelligence; that unconditional altruism can serve as an honest signal of intelligence. They believe that their findings imply that altruistic behavior can be distinguished from cooperative behavior.