proven construction methods
61Oil sands — The Athabasca oil sands in Alberta, Canada, are a very large source of bitumen, which can be upgraded to synthetic crude oil. Bituminous sands, colloquially known as oil sands or tar sands, are a type of unconventional petroleum deposit. The… …
62Personal rapid transit — ation concept that offers on demand, non stop transportation, using small, independent vehicles on a network of specially built guideways. Several different designs have been proposed, and as of 2008, at least one is under… …
63Concrete — This article is about the construction material. For other uses, see Concrete (disambiguation). Outer view of the Roman Pantheon, still the largest unreinforced solid concrete dome.[1] …
64Prime number — Prime redirects here. For other uses, see Prime (disambiguation). A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is… …
65Natural building — A natural building involves a range of building systems and materials that place major emphasis on sustainability. Ways of achieving sustainability through natural building focus on durability and the use of minimally processed, plentiful or… …
66List of The Dresden Files characters — The Dresden Files series features a diverse cast of complicated characters. Contents 1 Main characters 1.1 Harry Dresden 1.2 Karrin Murphy 1.3 Bob …
67Roman infantry tactics — refers to the theoretical and historical deployment, formation and maneuvers of the Roman infantry from the start of the Roman Republic to the fall of the Western Roman Empire. The article first presents a short overview of Roman training. Roman… …
68Foreign internal defense — (FID) is used by a number of Western militaries, explicitly by the United States but sharing ideas with countries including France and the United Kingdom, to describe an approach to combating actual or threatened insurgency in a foreign state… …
69ARAB POPULATION — GENERAL SURVEY Under the British Mandate, 1917–48 In 1917, at the time of the British conquest of Palestine during World War I, the country s Arabic speaking population numbered less than 600,000 persons; in 1947 it was estimated at 1,200,000.… …
70Steel — For other uses, see Steel (disambiguation). The steel cable of a colliery winding tower …
