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Rayon, also called viscose [1] and commercialised in some countries as sabra silk or cactus silk, [2] is a semi-synthetic fiber, [3] made from natural sources of regenerated cellulose, such as wood and related agricultural products. [4] It has the same molecular structure as cellulose.
Spinoff is a NASA publication featuring technology made available to the public. Since 1976, NASA has featured an average of 50 technologies each year in the annual publication, and Spinoff maintains a searchable database of these technologies. When products first spun off from space research, NASA presented a black and white report in 1973 ...
Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur ...
Synonyms. Ursus lotor Linnaeus, 1758. The raccoon ( ⫽ rəˈkuːn ⫽ or US: ⫽ ræˈkuːn ⫽ ⓘ, Procyon lotor ), also spelled racoon [3] and sometimes called the common raccoon or northern raccoon to distinguish it from the other species, is a mammal native to North America.
Can we imagine ourselves back on that awful day in the summer of 2010, in the hot firefight that went on for nine hours? Men frenzied with exhaustion and reckless exuberance, eyes and throats burning from dust and smoke, in a battle that erupted after Taliban insurgents castrated a young boy in the village, knowing his family would summon nearby Marines for help and the Marines would come ...
Hummingbirds are birds native to the Americas and comprise the biological family Trochilidae. With approximately 366 species and 113 genera, [1] they occur from Alaska to Tierra del Fuego, but most species are found in Central and South America. [2] As of 2024, 21 hummingbird species are listed as endangered or critically endangered, with ...
June 3, 2024 at 8:12 AM. Firefighters got the upper hand on a grass fire that began Saturday afternoon in San Joaquin County, California, but dangerous heat threatens to worsen the situation in ...
Early presidential elections in Iran were held on 28 June and 5 July 2024, [1] in which reformist candidate Masoud Pezeshkian won the second round with 54.76% of the vote. Following the death of the then president Ebrahim Raisi in a helicopter crash on 19 May, [2] early elections were announced. Four candidates contested the first round of the ...