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When a surface has a constant zero Gaussian curvature, then it is a developable surface and the geometry of the surface is Euclidean geometry.. When a surface has a constant positive Gaussian curvature, then the geometry of the surface is spherical geometry.
The rare-earth elements (REE), also called the rare-earth metals or rare earths, and sometimes the lanthanides or lanthanoids (although scandium and yttrium, which do not belong to this series, are usually included as rare earths), [1] are a set of 17 nearly indistinguishable lustrous silvery-white soft heavy metals.
A light source passes behind a gravitational lens (invisible point mass placed in the center of the image). The aqua circle is the light source as it would be seen if there were no lens, while white spots are the multiple images of the source (see Einstein ring).
The Seven Wonders of the Ancient World (from left to right, top to bottom): Great Pyramid of Giza, Hanging Gardens of Babylon, Temple of Artemis at Ephesus, Statue of Zeus at Olympia, Mausoleum at Halicarnassus (also known as the Mausoleum of Mausolus), Colossus of Rhodes, and the Lighthouse of Alexandria as depicted by 16th-century Dutch artist Maarten van Heemskerck.
Li Sisi (Chinese: 李思思; pinyin: Lǐ Sīsī; born 4 November 1986) is a Chinese television host and media personality. She rose to fame in 2006 when she earned a third-place finish on the reality TV show Host Challenge . [ 1 ]
Crohn's disease is a type of inflammatory bowel disease (IBD) that may affect any segment of the gastrointestinal tract. [3] Symptoms often include abdominal pain, diarrhea, fever, abdominal distension, and weight loss.
The Grand Canyon [a] is a steep-sided canyon carved by the Colorado River in Arizona, United States.The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,093 feet or 1,857 meters).
The term cattle was borrowed from Anglo-Norman catel (replacing native Old English terms like kine, now considered archaic, poetic, or dialectal), [1] itself from Medieval Latin capitale 'principal sum of money, capital', itself derived in turn from Latin caput 'head'.