"Android tech has been improving steadily, thanks to its popularity. And a lot of feedback from you and Howard." Bill nodded to Bridget. "I think your current mannies back on Quilt might be a couple of generations behind the bleeding edge, though." A Quinlan form materialized beside the generic android schematic. "The latest mannies no longer contain any metal at all. Circuitry, even the SCUT interface, is all quantum-bionics and metamaterials. We’ve gone to great lengths to make the density of the internals similar to bio physique, so mannies are no longer ludicrously heavy for their size. And we’ve introduced a circulatory system that contains fluid indistinguishable from blood. It acts as lubricant, coolant, and transport for repair nanites. We even have digestive systems that will convert food into, uh, quite believable waste products."