Word: layering
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...Yunque for years, it was the patches of wild morning-glories growing there that piqued Professor Ellis. Since the flower grew nowhere else around, she took it as an indication that the soil beneath was different in some way. Her students attacked the spot, and soon struck a layer of adobe. As the surface dirt was removed, more and more walls appeared, revealing the remains of a 25-room pueblo...
...Using a local anesthetic, he saws out a dime-sized piece of the skull, then inserts a three-in-one tube, only 2 mm. (less than 1½ in.) in diameter. The tube slips painlessly through the insensitive brain to the deep-lying thalamus. The tube's outer layer is a vacuum insulator; the innermost bore carries liquid nitrogen supplied at -196° C.; the middle layer is for warmed and gaseous nitrogen to escape...
Nine years ago Nathan M. Pusey came to Harvard from Lawrence College in Appleton, Wisconsin, to become President of an enormous institution built on layer after layer of sedimented traditions. A slow and delicate play of subterranean forces had brought it to its current stature, a vast and complex machinery that it would be foolish to meddle with too deeply. The University might change, but it would have to change more through a process of natural evolution than through administrative decisions initiating and guiding change...
Metallurgists have long known why metals do not bond themselves together when they come in contact in the earth's atmosphere. Exposed to air, they have already become covered with oxide films or a thin layer of gas that keeps the metals from actually touching. National Research scientists were interested in what happens when metals touch in the hard vacuum high above the earth's atmosphere. In their space simulation chamber they created an almost perfect vacuum (10 torr-), the same as spacecraft encounter 500 miles above the earth. In that ultra emptiness, surface gases evaporated; oxide films...
Bronze Tuberculosis. Hospitalized in the laboratory of the National Museum in Athens, the kouros was tenderly nursed back to bronze health. Ancient Greek sculptors used the "lost wax" process, making their original models of wax-covered clay. When the final details had been modeled in the wax, a second layer of clay was molded around it. Molten bronze poured between the two clay surfaces melted the wax and replaced it, forming a hollow statue of bronze filled with irremovable clay...