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Bacon, Roger

(Encyclopedia)Bacon, Roger, c.1214–1294?, English scholastic philosopher and scientist, a Franciscan. He studied at Oxford as well as at the Univ. of Paris and became one of the most celebrated and zealous teache...

Valéry, Paul

(Encyclopedia)Valéry, Paul pōl välārēˈ [key], 1871–1945, French poet and critic. A follower of the symbolists, Valéry was one of the greatest French poets of the 20th cent. He was encouraged by Pierry Loü...

Carnot, Lazare Nicolas Marguerite

(Encyclopedia)Carnot, Lazare Nicolas Marguerite kärnōˈ [key], 1753–1823, French revolutionary, known as the organizer of victory for his role in the French Revolutionary Wars. A military engineer by training,...

infinity

(Encyclopedia)infinity, in mathematics, that which is not finite; it is often indicated by the symbol ∞. A sequence of numbers, a1, a2, a3, … , is said to “approach infinity” if the numbers eventually b...

number theory

(Encyclopedia)number theory, branch of mathematics concerned with the properties of the integers (the numbers 0, 1, −1, 2, −2, 3, −3, …). An important area in number theory is the analysis of prime number...

Economic Community of West African States

(Encyclopedia)Economic Community of West African States (ECOWAS), organization established in 1975 to increase economic cooperation and development in West Africa. Members include Benin, Burkina Faso, Cape Verde, C...

National Institutes of Health

(Encyclopedia)National Institutes of Health (NIH), agency of the U.S. Public Health Service, with headquarters in Bethesda, Md. It was established initially in 1887 as a laboratory in the U.S. Marine Hospital on St...

energy, sources of

(Encyclopedia)energy, sources of, origins of the power used for transportation, for heat and light in dwelling and working areas, and for the manufacture of goods of all kinds, among other applications. The develop...

balance of power

(Encyclopedia)balance of power, system of international relations in which nations seek to maintain an approximate equilibrium of power among many rivals, thus preventing the preponderance of any one state. Crucial...

Energy, United States Department of

(Encyclopedia)Energy, United States Department of, executive department of the federal government responsible for coordinating national activities relating to the production, regulation, marketing, and conservation...