It turns out that multiculturalists--teachers and demonstrative students alike--cannot even expound on their area of expertise accurately. "Take hoop earrings, which date to ancient Assyria," Jonathan Zimmerman, who teaches education and history at Penn, writes in The Chronicle of Higher Education. "In Nimrud, located in present-day Iraq, there’s a depiction of King Ashurnasirpal II (884-859 B.C.) wearing thick hoop earrings." "The ancient Greeks and the Romans wore them, too; so did pirates in many parts of the Western world, who believed that hoop earrings contained healing powers or would protect them from drowning." "And, yes, hoop earrings were eventually adopted...