In the next chamber he found one bank of uterine replicators running 75% saturated in the waste toxins carried off by the exchange solution; the tech in charge explained he'd been waiting for it to hit the regulation 80% before doing the mandatory filter changes. Ethan explained, clearly and forcefully, the difference between minimum and optimum, and oversaw the filter changes and the subsequent drop back to a more reasonable 45% saturation.

The receptionist beeped him twice before penetrating his lecture to the tech on the exact shade of lemon-colored crystal brightness to be expected in an oxygen and nutrient exchange solution operating at peak performance. He dashed up to the office level and stood panting a moment outside his door, balancing the dignity of a spokesman for the Rep Center versus the discourtesy of making a patron wait. He took a deep breath that had nothing to do with his gallop upstairs, fixed a pleasant smile on his face, and pushed open the door with the DR. ETHAN URQUHART, CHIEF OF REPRODUCTIVE BIOLOGY raised in gold letters on its ivory plastic surface.

"Brother Haas? I'm Dr. Urquhart. No, no—sit down, make yourself comfortable," Ethan added as the man popped nervously to his feet, ducking his head in greeting. Ethan sidled around him to his own desk, feeling absurdly shielded.

The man was huge as a bear, red from long days in sun and wind; the hands that turned his cap around and around were thick with muscle and callus. He stared at Ethan. "I was expecting an older man," he rumbled.

Ethan touched his shaved chin, then became self-conscious of the gesture and put his hand down hastily.