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"Losses appear to loom larger than gains in some settings, but not in others," wrote a pair of Israeli behavioral scientists, Eyal Ert and Ido Erev, in one 2013 paper.

In fact, research into decision-making under threat suggests that concerns about looming mass panic are badly misplaced, according to Ido Erev, a professor of behavioral science and management at Technion-Israel Institute of Technology, in Haifa, Israel.

“I’m going to talk about how we are and always have been an ‘Erev Rav,’ ” Berman said this week, using a term from Exodus defined as the “mixed multitude” of people who fled biblical Egypt with the Israelites.

Yet, because so few Arabs and Muslims have prominent roles in Hebrew-language news in Israel, and because racism is so commonplace in Israeli society, Ms. Aharish says, she continues to receive a steady supply of hate mail merely for adding “masa’a al-kheir” to the “erev tov” she wishes her audience at the top of each weeknight show.

Then at 11 a.m., as the ceremony was about to begin, 10 violinists strolled down the center aisle of the temple playing “Sunrise, Sunset” followed by “Erev Shel Shoshanim,” a Hebrew love song often played at weddings.