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Democritus

(Encyclopedia)Democritus dĭmŏkˈrĭtəs [key], c.460–c.370 b.c., Greek philosopher of Abdera; pupil of Leucippus. His theory of the nature of the physical world was the most radical and scientific attempted up ...

functionalism, in anthropology and sociology

(Encyclopedia)functionalism, in anthropology and sociology, a theory stressing the importance of interdependence among all behavior patterns and institutions within a social system to its long-term survival. It was...

Aristotle

(Encyclopedia)Aristotle ărˌĭstŏtˈəl [key], 384–322 b.c., Greek philosopher, b. Stagira. He is sometimes called the Stagirite. After the decline of Rome, Aristotle's work was lost in the West. However, in ...

rationalism

(Encyclopedia)rationalism [Lat.,=belonging to reason], in philosophy, a theory that holds that reason alone, unaided by experience, can arrive at basic truth regarding the world. Associated with rationalism is the ...

W and Z particles

(Encyclopedia)W and Z particles, elementary particles that mediate, or carry, the fundamental force associated with weak interactions. The discovery of the W and Z particles at CERN near Geneva, Switzerland, in the...

Bernoulli

(Encyclopedia)Bernoulli or Bernouilli both: bĕrno͞oyēˈ [key], name of a family distinguished in scientific and mathematical history. The family, after leaving Antwerp, finally settled in Basel, Switzerland, whe...

Olbers, Heinrich Wilhelm Matthäus

(Encyclopedia)Olbers, Heinrich Wilhelm Matthäus hīnˈrĭkh vĭlˈhĕlm mätĕˈo͝os ôlˈbərs [key], 1758–1840, German astronomer and physician. He originated (1797) the first satisfactory method for calculat...

hydrogen bomb

(Encyclopedia)hydrogen bomb or H-bomb, weapon deriving a large portion of its energy from the nuclear fusion of hydrogen isotopes. In an atomic bomb, uranium or plutonium is split into lighter elements that togethe...

Teilhard de Chardin, Pierre

(Encyclopedia)Teilhard de Chardin, Pierre pyĕr tāyärˈ də shärdăNˈ [key], 1881–1955, French paleontologist and philosopher. He entered (1899) the Jesuit order, was ordained (1911), and received a doctorate...

Santayana, George

(Encyclopedia)Santayana, George säntäyäˈnä [key], 1863–1952, American philosopher and poet, b. Madrid, Spain. Santayana's philosophic stance has been given the apparently opposite descriptions of materiali...