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history

(Encyclopedia)history, in its broadest sense, is the story of humanity's past. It also refers to the recording of that past. The diverse sources of history include books, newspapers, printed documents, personal pap...

Denmark

(Encyclopedia)CE5 Denmark dĕnˈmärk [key], Dan. Danmark, officially Kingdom of Denmark, kingdom (2015 est. pop. 5,689,000), 16,629 sq mi (43,069 sq km), N Europe. It borders on Germany in the south, the North ...

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...

photography, still

(Encyclopedia)photography, still, science and art of making permanent images on light-sensitive materials. See also photographic processing; motion picture photography; motion pictures. By the end of ...

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...

Switzerland

(Encyclopedia)CE5 Switzerland swĭtˈsərlənd [key], Fr. Suisse, Ger. Schweiz, Ital. Svizzera, officially Swiss Confederation, federal republic (2015 est. pop. 8,320,000), 15,941 sq mi (41,287 sq km), central E...

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...

Saturn, in astronomy

(Encyclopedia)CE5 Saturn and its ring system as seen from Earth Saturn, in astronomy, 6th planet from the sun. Saturn has 82 confirmed natural satellites, many of which have not been named. Five of the discov...

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...