“Yes, Your Grace.” Allison shook herself again, then smiled crookedly. “Yes, indeed,” she said, and nodded much more comfortably at the holo image.

“As nearly as I can reconstruct what must have happened, Your Grace, at least one person, and possibly several, in your original colonial medical team must have been real crackerjack geneticists, especially given the limitations of the technology then available. As you may be aware, they were still using viruses for genetic insertions rather than the precisely engineered nanotech we use today, and given the crudity of such hack and slash methodologies, his—or their—achievements are truly remarkable.”

“I am less surprised to hear that than you might think, My Lady,” Sullivan interposed. “The original followers of Saint Austin were opposed to the way technology had, as they saw it, divorced men from the lives God wished them to lead. But they recognized the advances in the life sciences as the gift of a loving Father to His children, and their intention from the beginning was to transplant as much of that gift to Grayson as they could. And that was certainly as well for all of us when our ancestors discovered what sort of world they had come to.”

“I believe that probably constitutes at least a one or two thousand percent understatement, Your Grace,” Allison said wryly. “One of the things which has puzzled those of us who have studied the situation has been how your colony could possibly have survived for more than a generation or two amid such lethal concentrations of heavy metals. Obviously, some sort of adaptive change had to have occurred, but none of us could understand how it happened quickly enough to save the colony. Now, I think, I know.”

She took a sip of tea and crossed her own legs, leaning back in her chair and cradling the tissue-thin porcelain cup between her hands.

“Heavy metals enter the body via the respiratory and digestive tracts, Your Grace, hence your air filtration systems and the constant battle to decontaminate your farm soil. Apparently, whoever was responsible for this—” she jutted her chin at the holo image once again “—intended to build a filtration system into your bodies as well, by modifying the mucosal barriers in your lungs and digestive tract. Your secretory proteins are substantially different from, say, my own. They bind the metals—or a large proportion of them, at any rate—which allows them to be cleared from the body in sputum and other wastes, rather than being absorbed wholesale into the tissues. They don’t do a perfect job, of course, but they’re the reason your tolerance for heavy metals is so much higher than my own. Up until two or three months ago, the assumption, particularly in light of your ancestors’ limited technological resources and, um, attitude towards the resources they did have, was that this must represent a natural facet of adaptive evolution, even if we had no idea how it had happened so quickly.”

“But you no longer believe this to be the case,” Sullivan said quietly.