THEY WALKED DOWN A soft-floored, warmly-lit corridor to an elevator which whisked them up to the main level of the Neurophysical Institute Building. Another corridor led them to a room that might have been the common room of one of the more exclusive men’s clubs. There were soft chairs and shelves of books and reading tables and smoking stands, all quietly luxurious. There was no one in the room when the three men entered. “We can have some privacy here,” Dr. Farnsworth said. “None of the rest of the staff will come in until we’re through.” Colonel Mannheim looked at the biophysicist speculatively. “You seem to think secrecy’s important all of a sudden.” Bart Stanton grinned and kept silent. Dr. Farnsworth went over to a table, where an urn of coffee radiated soft warmth. “Cream and s