Columbia Encyclopedia

Search results

500 results found

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...

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...

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...

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...

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...

Eiffel, Alexandre Gustave

(Encyclopedia)Eiffel, Alexandre Gustave īˈfəl, Fr. älĕksäNˈdrə güstävˈ āfĕlˈ [key], 1832–1923, French engineer. A noted constructor of bridges and viaducts, he also designed the Eiffel Tower and the...

Doudna, Jennifer Anne

(Encyclopedia)Doudna, Jennifer Anne, 1964–, American biochemist, b. Washington, D.C., Ph.D. Harvard Medical School, 1989. Doudna was a professor at Yale from 1994 to 2002, when she joined the faculty at the Univ....

chemical analysis

(Encyclopedia)chemical analysis, the study of the chemical composition and structure of substances. More broadly, it may be considered the corpus of all techniques whereby any exact chemical information is obtained...

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 ...