reciprocal practice
31F-number — In optics, the f number (sometimes called focal ratio, f ratio, or relative aperture [Smith, Warren Modern Lens Design 2005 McGraw Hill] ) of an optical system expresses the diameter of the entrance pupil in terms of the focal length of the lens; …
32International copyright relations of Russia — The international copyright relations of Russia were virtually non existent in Tsarist Russia and during much of the history of the Soviet Union. Under the Tsars, only a few bilateral copyright treaties with other nations were concluded; these… …
33Nutritional economics — is a synthetic concept that deals with the interplay between economic systems, nutritional status and food security, and how changes in the former affect the latter. If economic and environmental changes in a community affect access to food, food …
34cañada — /keuhn yah deuh, yad euh/, n. Chiefly Western U.S. 1. a dry riverbed. 2. a small, deep canyon. [1840 50; < Sp, equiv. to cañ(a) CANE + ada n. suffix] * * * Canada Introduction Canada Background: A land of vast distances and rich natural resources …
35Canada — /kan euh deuh/, n. a nation in N North America: a member of the Commonwealth of Nations. 29,123,194; 3,690,410 sq. mi. (9,558,160 sq. km). Cap.: Ottawa. * * * Canada Introduction Canada Background: A land of vast distances and rich natural… …
36Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
37Science (Philosophies of) — Philosophies of science Mach, Duhem, Bachelard Babette E.Babich THE TRADITION OF CONTINENTAL PHILOSOPHY OF SCIENCE If the philosophy of science is not typically represented as a ‘continental’ discipline it is nevertheless historically rooted in… …
38Child support in the United States — Main article: Child support The law governing child support in the United States varies state by state and Native American tribe by tribe; each individual state and federally recognized tribe is responsible for developing its own guidelines for… …
39diplomacy — /di ploh meuh see/, n. 1. the conduct by government officials of negotiations and other relations between nations. 2. the art or science of conducting such negotiations. 3. skill in managing negotiations, handling people, etc., so that there is… …
40Apache — Infobox Ethnic group group = Apache poptime = 31,000+Fact|date=October 2007 popplace = Arizona, New Mexico and Oklahoma rels = Shamanism, Christianity langs = Chiricahua, Jicarilla, Lipan, Plains Apache, Mescalero, Western Apache related =… …
