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light

(Encyclopedia)light, visible electromagnetic radiation. Of the entire electromagnetic spectrum, the human eye is sensitive to only a tiny part, the part that is called light. The wavelengths of visible light range ...

radio

(Encyclopedia)CE5 A. AM transmitter B. AM receiver radio, transmission or reception of electromagnetic radiation in the radio frequency range. The term is commonly applied also to the equipment used, especially...

Hitler, Adolf

(Encyclopedia)Hitler, Adolf äˈdôlf hĭtˈlər [key], 1889–1945, founder and leader of National Socialism (Nazism), and German dictator, b. Braunau in Upper Austria. By July, 1944, the German military si...

psychology

(Encyclopedia)psychology, science or study of the thought processes and behavior of humans and other animals in their interaction with the environment. Psychologists study processes of sense perception, thinking, l...

electricity

(Encyclopedia)CE5 Electrical and radio symbols electricity, class of phenomena arising from the existence of charge. The basic unit of charge is that on the proton or electron—the proton's charge is designate...

element

(Encyclopedia)CE5 element, in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means o...

Paris, city, France

(Encyclopedia)Paris pârˈĭs, Fr. pärēˈ [key], city (1999 pop. 2,115,757; metropolitan area est. pop. 11,000,000), N central France, capital of the country, on the Seine River. It is the commercial and industri...

Germany

(Encyclopedia)CE5 Germany jûrˈmənē [key], Ger. Deutschland, officially Federal Republic of Germany, ...

Roosevelt, Franklin Delano

(Encyclopedia)Roosevelt, Franklin Delano rōˈzəvĕlt [key], 1882–1945, 32d President of the United States (1933–45), b. Hyde Park, N.Y. Apart from extending diplomatic recognition to the USSR (1933), th...

Finland

(Encyclopedia)CE5 Finland, Finnish Suomi swôˈmē [key], officially Republic of Finland, republic (2015 est. pop. 5,482,000), 130,119 sq mi (337,009 sq km), N Europe. It borders on the Gulf of Bothnia and Swede...