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Mycenaean civilization

(Encyclopedia)Mycenaean civilization mīsēnēˈən [key], an ancient Aegean civilization known from the excavations at Mycenae and other sites. They were first undertaken by Heinrich Schliemann and others after 18...

Humboldt, Alexander, Freiherr von

(Encyclopedia)Humboldt, Alexander, Freiherr von hŭmˈbōlt, Ger. älĕksänˈdər frīˈhĕr fən ho͝omˈbôlt [key], 1769–1859, German naturalist, inventor, explorer, and author, the most eminent scientist of ...

secret police

(Encyclopedia)secret police, policing organization operating in secrecy for the political purposes of its government, often with terroristic procedures. Many states, including Chile, Iran, Iraq, Israel, Romania,...

Heidegger, Martin

(Encyclopedia)Heidegger, Martin märˈtēn hīˈdĕger [key], 1889–1976, German philosopher. As a student at Freiburg, Heidegger was influenced by the neo-Kantianism of Heinrich Rickert and the phenomenology of E...

electromagnetic radiation

(Encyclopedia)CE5 Electromagnetic spectrum electromagnetic radiation, energy radiated in the form of a wave as a result of the motion of electric charges. A moving charge gives rise to a magnetic field, and if ...

sunspots

(Encyclopedia)sunspots, dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The spots are darker because the temperature of the spots is lower than that of the surro...

Houston

(Encyclopedia)Houston, city (2020 pop. 2,304,580), seat of Harris co., SE Tex., a deepwater port on the Houston Ship Channel; inc. 1837. Harrisburg (now part of Hou...

transistor

(Encyclopedia)CE5 Simple transistor circuit transistor, three-terminal, solid-state electronic device used for amplification and switching. It is the solid-state analog to the triode electron tube; the transist...

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...