Topic Summaries

groundwater pollution
water pollution summary
water pollution, The release of substances into a body of water where they become dissolved or suspended in the water or...
avocado summary
avocado, Fruit of Persea americana, of the laurel family, a tree native to the Western Hemisphere from Mexico south to the...
Leonardo da Vinci: self-portrait
Leonardo da Vinci summary
Leonardo da Vinci, (born April 15, 1452, Anchiano, Republic of Florence—died May 2, 1519, Cloux, France), Italian Renaissance...
Paolo Veneziano: The Crucifixion
cross summary
cross, Principal symbol of Christianity, recalling the crucifixion of Jesus.
book cover
crucifixion summary
crucifixion, Method of capital punishment among the Persians, Seleucids, Jews, Carthaginians, and Romans from about the...
Raphael: Resurrection of Christ
Easter summary
Easter, Major festival of the Christian church year, celebrating the Resurrection of Jesus on the third day after the Crucifixion.
Dwight L. Moody
Christian fundamentalism summary
Christian fundamentalism, Conservative Protestant movement that arose out of 19th-century millennialism in the U.S.
Judas Iscariot summary
Judas Iscariot, (died c. 30ce), Disciple who betrayed Jesus.
Pontius Pilate
Pontius Pilate summary
Pontius Pilate, (died c. 36 ce), Roman prefect of Judaea (26–36 ce) who presided at the trial of Jesus and gave the order...
Ukraine summary
Ukraine, Country, eastern Europe.
North Atlantic Treaty Organization
NATO summary
NATO, in full North Atlantic Treaty Organization , International military alliance created to defend western Europe against...
Jules Verne
Jules Verne summary
Jules Verne, (born Feb. 8, 1828, Nantes, France—died March 24, 1905, Amiens), French writer.
red kangaroo (Macropus rufus)
marsupial summary
marsupial, Any mammal of the infraclass Marsupialia, characterized by premature birth and continued development outside...
bryophyte moss
bryophyte summary
bryophyte, Any of the green, seedless, nonvascular land plants, numbering at least 18,000 species and divided into three...
giant sequoia
conifer summary
conifer, Any member of the order Pinales, woody plants that bear their seeds and pollen on separate cones.
tree fern
fern summary
fern, Any of about 10,000–15,000 species (class Polypodiopsida) of nonflowering vascular plants that have true roots, stems,...
pinyon pine
gymnosperm summary
gymnosperm, Any of the more than 1,000 species of woody vascular plants that reproduce by means of an exposed seed, or ovule,...
Okefenokee Swamp
swamp summary
swamp, Freshwater wetland ecosystem characterized by poorly drained mineral soils and plant life dominated by trees.
Roger Federer
Roger Federer summary
Roger Federer, (born Aug. 8, 1981, Basel, Switz.), Swiss tennis player.
Rafael Nadal
Rafael Nadal summary
Rafael Nadal, in full Rafael Nadal Parera , (born June 3, 1986, Manacor, Mallorca, Spain), Spanish tennis player.
Martin Luther King, Jr.
Martin Luther King, Jr. summary
Martin Luther King, Jr., (born Jan. 15, 1929, Atlanta, Ga., U.S.—died April 4, 1968, Memphis, Tenn.), U.S.
Sidney Poitier
Sidney Poitier summary
Sidney Poitier, (born Feb. 20, 1927, Miami, Fla., U.S.—died Jan. 6, 2022, Los Angeles, Calif.), Bahamian U.S.
Desmond Tutu
Desmond Tutu summary
Desmond Tutu, (born Oct. 7, 1931, Klerksdorp, S.Af.—died Dec. 26, 2021, Cape Town), South African Anglican cleric.
Giotto: The Nativity
Christmas summary
Christmas, Christian festival celebrated on December 25, commemorating the birth of Jesus.
Christmas tree
Christmas tree summary
Christmas tree, Evergreen tree, real or artificial, usually decorated with lights and ornaments to celebrate the Christmas...
Fra Filippo Lippi: Madonna and Child
Mary summary
Mary, or St.
sacrament summary
sacrament, Religious action or symbol in which spiritual power is believed to be transmitted through material elements or...
Persian empire
imperialism summary
imperialism, State policy, practice, or advocacy of extending power and dominion, especially by direct territorial acquisition...
British Empire
British Empire summary
British Empire, Worldwide system of dependencies—colonies, protectorates, and other territories—that over a span of three...
Pyramids of Giza
ancient Egyptian architecture summary
ancient Egyptian architecture, Architecture produced during the dynastic periods of the first three millennia bce in the...
vaccine summary
vaccine, Suspension of weakened, killed, or fragmented microorganisms or toxins or other biological preparation that is...
Madison summary
Madison, City (pop., 2020: 269,840), capital of Wisconsin, U.S.
Third Ward district, Milwaukee, Wisconsin.
Milwaukee summary
Milwaukee, City (pop., 2020: 577,222) and lake port, southeastern Wisconsin, U.S.
Seattle summary
Seattle, City (pop., 2020: 737,015) and seaport, Washington, U.S.
World War II: Germany invading Poland
World War II summary
World War II, or Second World War , (1939–45) International conflict principally between the Axis powers—Germany, Italy,...