Into a big empty lecture hall at New York's teeming City College marched four young women, three young men one evening last week. All students, they seated themselves in the front two rows. Attached to the back of each seat was a thin metal rod from which dangled a small silver-grey ball just above each student's forehead. Lights were dimmed. A hush fell over the room. Precisely at 9:51 p. m. a tall young instructor on the platform began in a soft sing-song voice:
"Take a comfortable position—and concentrate—your eyes on the grey ball...
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