Jewdar or J-dar is the argued ability of a person to be able to detect or intuitively sense whether another person is a Jew or Jewishness more generally.
Since the vast majority of Jews are closely related genetically, GST predicts that they will be very attracted to other Jews and may even be able to recognize them in the absence of distinctive clothing and hair styles. There is anecdotal evidence for this statement. Theologian Eugene Borowitz writes that Jews seek each other out in social situations and feel “far more at home” after they have discovered who is Jewish.54 “Most Jews claim to be equipped with an interpersonal friend-or-foe sensing device that enables them to detect the presence of another Jew, despite heavy camouflage.” Another Jewish writer comments on the incredible sense of oneness he has with other Jews and his ability to recognize other Jews in public places, a talent some Jews call “J-dar.”55 While dining with his non-Jewish fiancée, he is immediately recognized as Jewish by some other Jews, and there is an immediate “bond of brotherhood” between them that excludes his non-Jewish companion.
Robert Reich, Clinton administration Secretary of Labor, wrote that in his first face-to-face meeting with Federal Reserve Board Chairman Alan Greenspan, “We have never met before, but I instantly know him. One look, one phrase, and I know where he grew up, how he grew up, where he got his drive and his sense of humor. He is New York. He is Jewish. He looks like my uncle Louis, his voice is my uncle Sam. I feel we’ve been together at countless weddings, bar mitzvahs, and funerals. I know his genetic structure. I’m certain that within the last five hundred years—perhaps even more recently—we shared the same ancestor.”56 Reich is almost certainly correct: He and Greenspan do indeed have a recent common ancestor, and this genetic affinity causes them to have an almost supernatural attraction to each other. Or consider Sigmund Freud, who wrote that he found “the attraction of Judaism and of Jews so irresistible, many dark emotional powers, all the mightier the less they let themselves be grasped in words, as well as the clear consciousness of inner identity, the secrecy of the same mental construction.”57
- Kevin MacDonald. Understanding Jewish Influence I: Background Traits for Jewish Activism, http://www.kevinmacdonald.net/understandji-1.htm