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Chan Chan

(Encyclopedia)Chan Chan chän chän [key], ruins of an ancient city near Trujillo, N Peru. An early example of city planning, with a rectangular grid structure, it was probably begun in the period from a.d. 950 to ...

Gentile, Giovanni

(Encyclopedia)Gentile, Giovanni jōvänˈnē jāntēˈlā [key], 1875–1944, Italian philosopher and educator. He taught philosophy in several Italian universities and for many years contributed to the magazine of...

Geological Survey, United States

(Encyclopedia)Geological Survey, United States, bureau organized in 1879 under the Dept. of the Interior to unify and centralize the work already undertaken by separate surveys under Clarence King, F. V. Hayden, Ge...

Goodman, Nelson

(Encyclopedia)Goodman, Nelson (Henry Nelson Goodman), 1906–98, American philosopher, b. Somerville, Mass., grad. Harvard (Ph.D. 1941). He taught at Tufts (1945–46), the Univ. of Pennsylvania (1946–64), and Br...

Anderson, Philip Warren

(Encyclopedia)Anderson, Philip Warren, 1923–2020, American physicist, b. Indianapolis, Ind., Ph.D. Harvard, 1949. After graduation he worked at Bell Laboratories until 1984. From 1967 he also was on the faculty a...

graphene

(Encyclopedia)graphene, virtually transparent, highly conductive carbon material in which the atoms are organized into a honeycomblike arrangement and form a thin sheet that is one atom thick. Andre Geim and Konsta...

ophthalmoscope

(Encyclopedia)ophthalmoscope ŏfthălˈməskōpˌ [key], instrument used for examining the inner structure of the eye. The device was invented by the German physiologist H. L. F. von Helmholtz in 1851. His model co...

pathology

(Encyclopedia)pathology, study of the cause of disease and the modifications in cellular function and changes in cellular structure produced in any cell, organ, or part of the body by disease. The changes in tissue...

flint, mineral

(Encyclopedia)flint, variety of quartz that commonly occurs in rounded nodules and whose crystal structure is not visible to the naked eye. Flint is dark gray, smoky brown, or black in color; pale gray flint is cal...

Hirsch, Samson Raphael

(Encyclopedia)Hirsch, Samson Raphael, 1808–88, German rabbi and chief exponent of Neo-Orthodoxy. As rabbi in Frankfurt-am-Main, he advocated the organization of autonomous Orthodox congregations outside the state...