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Agnelli

(Encyclopedia)Agnelli än-yĕlˈlē [key], family of Italian industrialists. Giovanni Agnelli, 1866–1945, served as a cavalry officer until 1892. One of the founders (1899) of Fiat (Fabbrica Italiana Automobili T...

water power

(Encyclopedia)water power, mechanical energy derived from falling or flowing water, e.g., rivers, streams, and the overflow of dams. The wooden water wheel, long utilized for driving machinery in flour mills and fa...

Guyana

(Encyclopedia)CE5 Guyana gīănˈə, –änˈ– [key], officially Co-operative Republic of Guyana, republic (2015 est. pop. 769,000), 83,000 sq mi (214,969 sq km), NE South America. It is bordered on the N by t...

nonlinear dynamics

(Encyclopedia)nonlinear dynamics, study of systems governed by equations in which a small change in one variable can induce a large systematic change; the discipline is more popularly known as chaos (see chaos theo...

Martinique

(Encyclopedia)CE5 Mauritania môrĭtāˈnēə [key], officially Islamic Republic of Mauritania, republic (2015 est. pop. 386,000), 397,953 sq mi (1,030,700 sq km), NW Africa. Fort-de-France is the capital. The d...

flycatcher

(Encyclopedia)flycatcher, common name for various members of the Old World family Muscicapidae, insectivorous songbirds including the kingbirds, phoebes, and pewees. Flycatchers vary in color from drab to brilliant...

International Monetary Fund

(Encyclopedia)International Monetary Fund (IMF), specialized agency of the United Nations, established in 1945. It was planned at the Bretton Woods Conference (1944), and its headquarters are in Washington, D.C. Th...

COVID-19

(Encyclopedia)COVID-19, contagious viral disease caused by severe acute respiratory syndrome coronavirus 2, or SARS-CoV-2, a coronavirus that is genetically related to SARS-CoV, which causes SARS. Symptoms generall...

diamond

(Encyclopedia)diamond, mineral, one of two crystalline forms of the element carbon (see allotropy), the hardest natural substance known, used as a gem and in industry. The discoveries of 1870–71 in South Africa...

lava

(Encyclopedia)lava läˈvə [key], molten rock that erupts on the earth's surface, either on land or under the ocean, by a volcano or through a fissure. It solidifies into igneous rock that is also called lava. Bef...