"At one extreme, you will have mutual antagonism. This arises when the ill child becomes jealous of the other's health, while, on the other hand, the healthy one becomes jealous of the extra consideration that is shown to his crippled brother. "At the other extreme, the healthy boy may identify so closely with his brother that he feels every slight or hurt, real or imagined, which the ill boy is subjected to. He becomes extremely over-solicitous, over-protective. At the same time, the invalid brother may come to depend completely on his healthy twin. "In both these situations there is a positive feedback that constantly worsens the condition. It requires a great deal of careful observation and careful application of the proper educational stimuli to keep the situation from developing toward either extreme. You'll need expert help if you want both boys to display the full abilities of which they are potentially capable." "I see," the woman said. "Could you give me the name of a good man, Doctor?" The doctor nodded and picked up a book on his desk. "I'll give you the names of several. You can pick the one you like best, the one with whom you seem to be most comfortable. Try several or all of them before you decide. They're all good men. There are many good women in the field, too, but in this case I think a man would be best. Of course, if one of them thinks a woman is indicated, that's up to him. As I said, that isn't my field." He opened the small book and riffled through it to find the names he wanted. _[7]_ The image of the Nipe on the glowing screen was clear and finely detailed. It was, Stanton thought, as though one were looking through a window into the Nipe's nest itself. Only the tremendous depth of focus of the lens that had caught the picture gave the illusion a feeling of unreality. Everything--background and foreground alike--was sharply in focus. Like some horrendous dream monster, the Nipe moved in slow motion, giving Stanton the eerie feeling that the alien was moving through a thicker, heavier medium than air, in a place where the gravity was much less than that of Earth. With ponderous deliberation, the fingers of one of his hands closed upon the handle of an oddly shaped tool and lifted it slowly from the surface upon which he worked. "That's our best-placed camera," said Colonel Mannheim, "but some of the others can always get details that this one doesn't. The trouble is that we'll never really have enough cameras in there--not unless we stud the walls, ceilings, and floors with them, and even then I'm not so sure we'd get everything. It isn't the same as having a trained expert on camera who is _trying_ to demonstrate what he's doing. An expert plays to the camera and never obstructs any of his own movements. But the Nipe ..." He left the sentence unfinished and shook his head sadly.