How to Make a Vertical Wall-Mounted Chessboard « Board Games
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The Tusi-couple is a mathematical device in which a small circle rotates inside a larger circle twice the diameter of the smaller circle. Rotations of the circles cause a point on the circumference of the smaller circle to oscillate back and forth in linear motion along a diameter of the larger circle. The couple was first proposed by the 13th-century Persian astronomer and mathematician Nasir al-Din al-Tusi in his 1247 Tahrir al-Majisti.
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scythians - Google Image Result for http://www.silk-road.com/maps/images/scymap1.jpg
Commagene was a small kingdom, located in modern south-central Turkey, with its capital at Samosata. It was first mentioned in Assyrian texts as Kummuhu, which was normally an ally of Assyria, but eventually annexed as a province in 708 BCE under Sargon II. The Achaemenid Empire then conquered it in the 6th century BCE and Alexander conquered the territory in the 4th century BCE. After the breakup of the Alexandrian Empire, Commagene was a state and province in the Greco-Syrian Seleucid…
Map of Europe, 476 CE - Ostrogoths, Visigoths, Alemanni, Gepids, Vandals, Eastern Roman Empire, Thuringians, etc