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But Dr. X's whole affect seemed to deliver the message that if you were going to sign a Faustian bargain with an ancient and inscrutable Shanghainese organized-crime figure, you could hardly do better than the avuncular Dr. X, who was so generous that he would probably forget about it altogether, or perhaps just stow the favor away in a yellowed box in one of his warrens.

Most of the children had reached the age when they were no longer naturally endearing to anyone save their own parents; the size when their energy was more a menace than a wonder; and the level of intelligence when what would have been called innocence in a smaller child was infuriating rudeness.

--I'm in the mood for some brain-challenging SF. This looks like it will fit the bill.