By Clyde Haberman
November 23, 2014

The notion that a person might embody several personalities, each of them distinct, is hardly new. The ancient Romans had a sense of this and came up with Janus, a two-faced god. In the 1880s, Robert Louis Stevenson wrote “Strange Case of Dr. Jekyll and Mr. Hyde,” a novella that provided us with an enduring metaphor for good and evil corporeally bound. Modern comic books are awash in divided personalities like the Hulk and Two-Face in the Batman series. Even heroic Superman has his alternating personas.

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