Paraíba, estado (state) of northeastern Brazil. Primarily an agricultural state, Paraíba is bounded by the states of Rio Grande do Norte on the north, Ceará on the west, and Pernambuco on the south and …

Dec 2, 2025 · pound sterling, the basic monetary unit of Great Britain, divided (since 1971) decimally into 100 new pence. The term is derived from the fact that, about 775, silver coins known as …

2 days ago · Artificial intelligence (AI) is the ability of a digital computer or computer-controlled robot to perform tasks commonly associated with intelligent beings. The term is frequently applied to the …

Nov 28, 2025 · Architecture, the art and technique of designing and building, as distinguished from the skills associated with construction. The practice of architecture is employed to fulfill both practical …

Dec 5, 2025 · Natural selection, process in which an organism adapts to its environment through selectively reproducing changes in its genotype. It reduces the disorganizing effects of migration, …

Sine, one of the six trigonometric functions, which, in a right triangle ABC, for an angle A, issin A = length of side opposite angle A length of hypotenuse .(The other five trigonometric functions are …

Nov 28, 2025 · By 1950 most theoretical writings concentrated almost exclusively on visual aspects of architecture, thereby identifying the theory of architecture with what, before 1750, would have been …

Quantum, in physics, discrete natural unit, or packet, of energy, charge, angular momentum, or other physical property. Light, for example, appearing in some respects as a continuous electromagnetic …

Energy and power, while closely related, are distinct concepts in science, each with its unique characteristics and applications. Energy is fundamentally the capacity to perform work, whereas …

Nov 27, 2025 · Castration, Removal of the testes. The procedure stops most production of the hormone testosterone. If done before puberty, it prevents the development of functioning adult sex organs. …