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aerogel
(Encyclopedia) aerogel, any of a group of extremely light and porous solid materials; the lightest is less than four times as dense as dry air. Aerogels are produced from certain gels (see colloid)…Thule , town, Greenland
(Encyclopedia) ThuleThuleth&oomacr;ˈlē, t&oomacr;ˈ– [key] or QaanaaqThulekänäkˈ [key], town (1995 pop. 627), N Greenland, on the north side of Inglefield Gulf. The name of Thule was…William, prince of Wales
(Encyclopedia) William, (William Arthur Philip Louis), 1982–, Prince of Wales of Great Britian, eldest son of King Charles…trachea
(Encyclopedia) tracheatracheatrāˈkēə [key] or windpipe, principal tube that carries air to and from the lungs. It is about 41&fslsh;2 in. (11.4 cm) long and about 3&fslsh;4 in. (1.9 cm) in…Archimedes' principle
(Encyclopedia) Archimedes' principle, principle that states that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. The principle applies to both floating…Dover, cities, United States
(Encyclopedia) Dover. 1 City (2020 pop. 39,403), state capital, and seat of Kent co., central Del., on the St. Jones River; founded 1683 on orders of…lungs
(Encyclopedia) lungs, elastic organs used for breathing in vertebrate animals, excluding most fish, which use gills, and a few amphibian species that respire through the skin. The word is sometimes…firefly
(Encyclopedia) firefly or lightning bug, small, luminescent, carnivorous beetle of the family Lampyridae. Fireflies are well represented in temperate regions, although the majority of species are…Tacna
(Encyclopedia) Tacna, city (1993 pop. 115,633), capital of Tacna dept., S Peru, on the Río Caplina. Tacna is an agricultural center that produces tobacco, grapes, cotton, and sugarcane. It is on the…Antaeus
(Encyclopedia) AntaeusAntaeusăntēˈəs [key], in Greek mythology, giant; son of Poseidon and Gaea, the goddess of the earth. He became stronger whenever he touched the earth, his mother. He killed…Trending
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