Until three months ago, University of Pennsylvania psychology professor Michael Kahana said he had never felt the need to wear a yarmulke, or Jewish skullcap, to his classes. "It started Oct. 7. I now feel that if I don’t wear a yarmulke then my students might not feel that they can," said Kahana, one of the organisers of some 30 Penn faculty on a solidarity mission to Israel this week.
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