Ciekawostka: The Great Wall of China is the only man-made structure visible from space

Evidence: 59 • authority: 72

The Ming Great Wall (Chinese: 明長城; pinyin: Míng Chángchéng), built by the Ming dynasty (1368–1644), forms the most visible parts of the Great Wall of China today. A comprehensive archaeological survey, using advanced technology has concluded that the Ming walls measure 8,850 km (5,500 mi) from Jiayu Pass in the west to the sea in Shanhai Pass, then looping over to terminate in Manchuria at the Hushan Great Wall. This is made up of 6,259 km (3,889 mi) sections of actual wall, 359 km (223 mi) of trenches and 2,232 km (1,387 mi) of natural defensive barriers such as hills and rivers. While the Ming walls are generally referred to as "Great Wall" (changcheng) in modern times, in Ming times they…

Evidence: 59 • authority: 72

The history of the Great Wall of China began when fortifications built by various states during the Spring and Autumn (771–476 BC) and Warring States periods (475–221 BC) were connected by the first emperor of China, Qin Shi Huang, to protect his newly founded Qin dynasty (221–206 BC) against incursions by nomads from Inner Asia. The walls were built of rammed earth, constructed using forced labour, and by 212 BC ran from Gansu to the coast of southern Manchuria. Later dynasties adopted different policies towards northern frontier defense. The Han (202 BC – 220 AD), the Northern Qi (550–574), the Jurchen-ruled Jin (1115–1234), and particularly the Ming (1369–1644) were among those that rebu…

Evidence: 49 • authority: 92

Neonatal immature gastric teratoma: a case report.. Background Gastric teratomas (GTs) are exceedingly rare neoplasms, accounting for less than 1% of all teratomas in children. Notably, GT arising from the anterior gastric wall is even rarer, with only a handful of cases reported in the literature, and the transmural growth pattern of such tumors further adds to their clinical uniqueness. Case presentation We report a case of immature gastric teratoma arising from the anterior gastric wall in a term male neonate. The mass was detected on prenatal ultrasonography at 37 weeks and 6 days of gestation, and the infant was admitted on the first day of life for evaluation. Abdominal computed tomog…

Evidence: 49 • authority: 72

The Great Wall of China is a series of fortifications in China. They were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups from the Eurasian Steppe. The first walls date to the 7th century BC; these were joined together in the Qin dynasty. Successive dynasties expanded the wall system; the best-known sections were built by the Ming dynasty (1368–1644). To aid in defense, the Great Wall utilized watchtowers, troop barracks, garrison stations, signaling capabilities through the means of smoke or fire, and its status as a transportation corridor. Other purposes of the Great Wall have included border controls…

Evidence: — • authority: 35