Breckenridge said, "We have listed every important scientist of every branch of natural science. They'll all be at Cheyenne. There will be only one point on the agenda: How to advance robotics. The major specific sub-heading under that will be: How to develop a receiving device for the electromagnetic fields of the cerebral cortex that will be sufficiently delicate to distinguish between a protoplasmic human brain and a positronic humanoid brain." Jeffreys said, "We had hoped you would be willing to be in charge of the conference." "I was not consulted in this." "Obviously time was short, sir. Do you agree to be in charge?" Lynn smiled briefly. It was a matter of responsibility again. The responsibility must be clearly that of Lynn of Robotics. He had the feeling it would be Breckenridge who would really be in charge. But what could he do? He said, "I agree." * * * * * Breckenridge and Lynn returned together to Cheyenne, where that evening Laszlo listened with a sullen mistrust to Lynn's description of coming events. Laszlo said, "While you were gone, Chief, I've started putting five experimental models of humanoid structure through the testing procedures. Our men are on a twelve-hour day, with three shifts overlapping. If we've got to arrange a conference, we're going to be crowded and red-taped out of everything. Work will come to a halt." Breckenridge said, "That will be only temporary. You will gain more than you lose." Laszlo scowled. "A bunch of astrophysicists and geochemists around won't help a damn toward robotics." "Views from specialists of other fields may be helpful." "Are you sure? How do we know that there _is_ any way of detecting brain waves or that, even if we can, there is a way of differentiating human and humanoid by wave pattern. Who set up the project, anyway?" "I did," said Breckenridge. "_You_ did? Are you a robotics man?" The young Security agent said, calmly, "I have studied robotics." "That's not the same thing." "I've had access to text-material dealing with Russian robotics--in Russian. Top-secret material well in advance of anything you have here." Lynn said, ruefully, "He has us there, Laszlo." "It was on the basis of that material," Breckenridge went on, "that I suggested this particular line of investigation. It is reasonably certain that in copying off the electromagnetic pattern of a specific human mind into a specific positronic brain, a perfectly exact duplicate cannot be made. For one thing, the most complicated positronic brain small enough to fit into a human-sized skull is hundreds of times less complex than the human brain. It can't pick up all the overtones, therefore, and there must be some way to take advantage of that fact."