Dr. Lena Aris had read that warning a hundred times. It was the first thing she saw every morning when she walked into Sublevel 7 of the Groom Lake Facility. Spine 3899 floated in a tank of viscous amber gel, a perfect human vertebral column, from atlas to coccyx, each vertebra carved from a material that had no business existing on Earth: a bone-like polymer that predated the dinosaurs.