Word: layers
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...formed into a hollow sphere containing a small neutron source that might be made of radium and beryllium. The plutonium itself would be wrapped in a beryllium or uranium reflector, which helps contain neutrons and prolong the chain reaction. This shield would in turn be covered by a layer of TNT charges, the most critical aspect of the design. The charges would have to be so carefully shaped that the detonation would direct their force largely inward, crushing the plutonium into a solid, compact ball. The plutonium would quickly reach what bombmakers call supercritical density. As the chain reaction went...
...rare gift on the down-and-out Grizabella: a tenth life. The stage becomes misty, an otherworldly light suffuses the theater, a giant tire rises eerily above the pussylanimous crowd, and Grizabella ascends, reborn and apotheosized, "up up up past the Russell Hotel, up up up to the Heaviside layer." This is heaven for cats and a stunning, vertiginous climax for the show...
Treating Atherosclerosis. This condition refers to the narrowing of the arteries by a buildup of fatty deposits. Today many heart specialists theorize that atherosclerosis is a complex process that starts with a minor injury to the smooth single layer of cells that line the arteries in a cobblestone pattern. Researchers speculate that the damage may result from cigarette smoking, high blood pressure or virus infection...
Like natural skin, the man-made version is composed of two main layers. The innermost, corresponding to the dermis, is a mixture of a protein from cowhide and a complex carbohydrate derived from shark cartilage. When mixed with an acidic solution, the two ingredients become short white fibers. Freeze-dried and vacuum treated to remove moisture, the fibers form a light and highly porous white sheet of material, which is placed in an oven at a high temperature. The topmost layer, equivalent to the epidermis, is made by bonding a viscous plastic onto the cowhide-shark sheet. The completed skin...
...into the new material, just like blood vessels and connective tissue. So these patients have the same kind of sensations as with a skin graft. It isn't perfect, but it is very good." The artificial dermis breaks down as new natural tissue forms. The plastic top layer acts solely as a temporary protective covering; beginning as early as ten days after the artificial skin graft, postage-stamp size patches of plastic are peeled away and replaced by slivers of the patient's own epidermal tissue...