Topic Summaries

Martin Luther King, Jr., at the March on Washington
Key Facts About the American Civil Rights Movement
This is a list of key facts about the American civil rights movement, a movement against racial discrimination in the United...
Martin Luther King, Jr., at the March on Washington
Causes and Effects of the American Civil Rights Movement
This is a list of some of the causes and effects of the American civil rights movement, which achieved national prominence...
Plains zebras
What are the subspecies of zebras?
zebra, Any of three species of black-and-white-striped equines that subsist almost entirely on grass.
African American male suffrage
Reconstruction Timeline
This timeline lists significant events connected to Reconstruction, the period in U.S. history from 1865 to 1877. Attempts...
African American male suffrage
Reconstruction Key Facts
This is a list of key facts about the Reconstruction era. Reconstruction was the period in U.S. history from 1865 to 1877...
John Adams
An outline about the vice presidency and presidency of John Adams
John Adams, (born Oct. 30, 1735, Braintree, Mass.—died July 4, 1826, Quincy, Mass., U.S.), U.S.
Learn about the Battle of Adwa between the Ethiopian army and Italian forces
Battle of Adwa, or Battle of Adowa , (March 1, 1896) Military clash at Adwa, in north-central Ethiopia, between the Ethiopian...
Principal sites associated with Aegean civilizations.
Learn about the cultures under the Aegean civilizations
Aegean civilizations, The Bronze Age civilizations that arose and flourished c. 3000–1000 bce in the region bordering the...
Edmund Burke
Learn about the nature and approaches of aesthetics
Aesthetics , Philosophical study of the qualities that make something an object of aesthetic interest and of the nature...
Soviet invasion of Afghanistan
Learn about the outbreak of civil war in Afghanistan and its results
Afghan wars, Series of wars in Afghanistan during the 19th, 20th, and early 21st centuries.
Afghanistan
Uncover the historical beginnings of Afghanistan under the Achaemenian Empire, 6th cent BCE to the present time
Afghanistan, officially Islamic State of Afghanistan , Country, south-central Asia.
Africa
Learn about the people, language, and history of Africa
Africa, Second largest continent on Earth.
Battle of Agincourt
Learn about the Battle of Agincourt, the decisive victory of the English over the French
Battle of Agincourt, (October 25, 1415)Battle resulting in the decisive victory of the English over the French in the Hundred...
Alexander the Great
Explore the military campaigns of Alexander the Great
Alexander the Great, or Alexander III , (born 356 bc, Pella, Macedonia—died June 13, 323 bc, Babylon), King of Macedonia...
mathematicians of the Greco-Roman world
Understand the purpose and structure of algebra
algebra, Generalized version of arithmetic that uses variables to stand for unspecified numbers.
Algeria
Know about the geography, economy, and history of Algeria
Algeria, officially People’s Democratic Republic of Algeria , Country, North Africa.
Battle of Gettysburg
Learn about the causes and the landmark battles of the American Civil War
American Civil War, or Civil War or War Between the States , (1861–65) Conflict between the U.S.
banded fire salamander (Salamandra terrestris)
What are examples of an amphibian?
Amphibian, Any member of a class (Amphibia) of cold-blooded vertebrate animals that includes more than 6,200 species in...
The transformation of a circular region into an approximately rectangular regionThis suggests that the same constant (π) appears in the formula for the circumference, 2πr, and in the formula for the area, πr2. As the number of pieces increases (from left to right), the “rectangle” converges on a πr by r rectangle with area πr2—the same area as that of the circle. This method of approximating a (complex) region by dividing it into simpler regions dates from antiquity and reappears in the calculus.
Understand the concept of analysis in mathematics
Analysis, Field of mathematics that incorporates the methods of algebra and calculus—specifically of limits, continuity,...
Gottlob Frege
Learn about the nature of analytic philosophy
Analytic philosophy, Philosophical tradition that emphasizes the logical analysis of concepts and the study of the language...
cave dwellings in Cappadocia
Learn about the boundaries and history of Anatolia
Anatolia, or Asia Minor Turkish Anadolu , Peninsula forming the western extremity of Asia.
Angola
Learn about the historical background of Angola, the Portuguese colonization, and the civil war
Angola, officially Republic of Angola, formerly Portuguese West Africa , Country, southern Africa.
Fallow deer (Dama dama)
Learn about the characteristics of animals
Animal, Any member of the kingdom Animalia (see taxonomy), a group of many-celled organisms that differ from members of...
The structure of polychaetes. (Left) Free-moving polychaetes. (A) Neanthes, (B) Nereis. (Right) Tube-dwelling (sedentary) polychaetes. (C) Amphitrite, (D) Sabella.
Know about the structure and classes of annelid
Annelid , Any member of a phylum (Annelida) of invertebrate animals that possess a body cavity (coelom), movable bristles...
Margaret Mead conducting fieldwork in Bali
Learn about the study of anthropology and its various branches
Anthropology, The “science of humanity.” Anthropologists study human beings in aspects ranging from the biology and evolutionary...
St. Thomas Aquinas
Learn about the life of Saint Thomas Aquinas and his contribution to philosophy and theology
Saint Thomas Aquinas, (born 1224/25, Roccasecca, near Aquino, Terra di Lavoro, Kingdom of Sicily—died March 7, 1274, Fossanova,...
Six-Day War in the Golan Heights
Learn about the causes and consequences of the Arab-Israeli wars
Arab-Israeli wars, Series of military conflicts fought between various Arab countries and Israel (1948–49, 1956, 1967, 1969–70,...
garden spider
Learn about the anatomy of arachnids
Arachnid , Any member of the class Arachnida, primarily carnivorous arthropods having a well-developed head, a hard external...
Foster and Partners: the Great Court
Learn about the needs of architecture in designing buildings
Architecture, Art and technique of designing and building, as distinguished from the skills associated with construction.
Argentina
Learn about Argentina and its independence from Spain
Argentina, officially Argentine Republic , Country, southern South America.
Aristotle
Know about Aristotle and his contribution to philosophy and science
Aristotle, (born 384, Stagira—died 322 bc, Chalcis), Greek philosopher and scientist whose thought determined the course...
Talat Paşa
Learn about the Armenian Genocide, the deliberate killing and deportation of Armenians by the Turks of the Ottoman Empire
Armenian Genocide, Campaign of murder and expulsion conducted against the Armenian subjects of the Ottoman Empire by the...
spiny lobster
Know about the structure and classification of arthropods
Arthropod, Any member of the largest phylum, Arthropoda, in the animal kingdom.
Your preference has been recorded
Savings that POP!
Learn More!