Chemical element named mendelevium in honor of D.I. Mendeleev, the first to arrange the elements in a periodic manner. Most recently, the synthesis of element 118 (since named oganesson) was reported in October 2006, and the synthesis of element 117 (tennessine) was reported in April 2010. Ten materials familiar to various prehistoric cultures are now known to be chemical elements: Carbon, copper, gold, iron, lead, mercury, silver, sulfur, tin, and zinc. Three additional materials now accepted as elements, arsenic, antimony, and bismuth, were recognized as distinct substances prior to 1500 AD. Phosphorus, cobalt, and platinum were isolated before 1750. Most of the
Infinity symbol in these books' descriptions of the shapes of bicycle tire tracks and of the outlines of half-remembered people. The poem after which "Pale Fire" is entitled explicitly refers to "the miracle of the lemniscate". The well known shape and meaning of the infinity symbol have made it a common typographic element of graphic design. For instance, the Métis flag, used by the Canadian Métis people in the early 19th century, is based around this symbol. In modern commerce, corporate logos featuring this symbol have been used by, among others, Room for PlayStation Portable, Microsoft Visual Studio, Fujitsu, and CoorsTek. The