- Brain and nerves
- Brazil 79-
- Bridges
- Bronze Age
- Buddhism
- 85-
- Byzantine Empire
- Caesar, Julius C
- Cameras
- Camouflage, animal
- Canada 91-
- Canada, history of
- Caribbean 95-
- Cars 97-
- Castles 99-
- Cats 101-
- Caucasus Republics
- Caves
- Celts
- 106- Central Africa
- Central America 108-
- Central Asia 110-
- Charlemagne
- Chemistry
- China 114-
- Christianity 118-
- Churchill, Sir Winston
- Cities
- Civil rights
- Civil War 123-
- Climates
- Clocks and watches
- Coal
- Cold War 128-
- Colombia
- Colonial America
- Color
- Columbus, Christopher
- Comets and meteors
- Communism
- Composers 136-
- Computers 138-
- Congress
- Conquistadors
- 142- endangered species
- Constitution
- Continents
- Cook, James
- jellyfish Corals, anemones, and
- crustaceans Crabs and other
- alligators Crocodiles and
- Crusades
- Abolitionist movement A
- Aboriginal Australians
- Africa 10-
- Africa, history of 14-
- African Americans
- Aircraft 17-
- Alexander the Great
- Alphabets
- American Revolution 21-
- Animals 23-
- Animal senses 25-
- Antarctica 27-
- Ants and termites
- Archaeology 30-
- Architecture 32-
- Arctic 34-
- Argentina 36-
- Armor
- Asia 39-
- Asia, history of 43-
- Assyrians
- space travel Astronauts and
- Astronomy 47-
- Atlantic Ocean 49-
- Atmosphere
- Atoms and molecules
- Australia 53-
- Australia, history of 57-
- Austria
- Aztecs
- Babylonians B
- Austria
- Baltic States and Belarus
- Barbarians
- Barton, Clara
- Baseball
- Basketball
- Bats
- Bears and pandas
- Bees and wasps
- Beetles
- Benin Kingdom
- Big Bang
- Biology
- Birds 74-
- Black Death
- Black holes
- Dams D
- Dance
- Darwin, Charles
- Independence Declaration of
- Deep-sea wildlife 155-
- Democracy
- the 1930s Depression of
- Desert wildlife 159-
- Digestion
- Dinosaurs 162-
- Disease
- 165- Dogs, wolves, and foxes
- Drugs
- Ears E
- Earth 169-
- Earthquakes
- Disease
- East Africa 172-
- 175- Ecology and food webs
- Edison, Thomas
- Egypt, Ancient 178-
- Einstein, Albert
- Electricity 181-
- Electronics
- Elephants
- Elizabeth I
- Energy
- Engines 187-
- Electronics
- Electricity 181-
- English Civil War
- Europe 190-
- European Union
- Einstein, Albert
- Europe, history of 195-
- Evolution 197-
- Explorers 199-
- Eyes
- Farm animals 202- F • G
- Farming
- Farming, history of
- Fish 206-
- Fishing industry
- Flies and mosquitoes
- Flight, animal 210-
- Flowers and herbs 212-
- Football
- Force and motion
- Forest wildlife 216-
- Fossils
- France 219-
- Franklin, Benjamin
- French Revolution
- amphibians Frogs and other
- French Revolution
- Fruits and seeds 226-
- Gas
- Genetics 229-
- Geology
- Germany 232-
- Glaciers and ice caps
- Glass and ceramics
- 238- Government and politics
- Glass and ceramics
- Grassland wildlife 241-
- Gravity
- Greece
- Greece, Ancient 245-
- Habsburgs H • I
- Health and fitness 248-
- Heart and blood
- Heat 251-
- Helicopters
- Hibernation
- Hinduism
- Hispanic Americans
- Hockey
- Holidays
- Holocaust
- 260- Horses, zebras, and asses
- Human body 262-
- Human rights
- Immigration 265-
- Incas
- 268- India and subcontinent
- Incas
- Indian Ocean 272-
- 274- Industrial Revolution
- Heart and blood
- Indus Valley civilization
- 277- Information technology
- Insects 279-
- Internet
- Inuits
- Iran
- Inuits
- Internet
- Democracy
- Black holes
- Ireland 284-
- Iron Age
- Big Bang
- Iron and steel
- Islam
- Israel
- Italy 290-
- Japan 293- J • K • L
- Bees and wasps
- Jefferson, Thomas
- Jesus Christ
- Joan of Arc
- Judaism
- Kennedy, John F.
- King, Jr., Martin Luther
- 302- Knights and heraldry
- Korea
- Korean War
- Labor movement
- 307- Lake and river wildlife
- Lakes
- Languages
- Law 311-
- Leonardo da Vinci
- Lewis and Clark
- Light 315-
- Lincoln, Abraham
- big cats 318- Lions, tigers, and other
- Literature 320-
- Lizards 322-
- Lewis and Clark
- Low Countries 324-
- Lungs and breathing
- Machines 327- M
- Magnetism
- Mammals 330-
- Mandela, Nelson
- Mao Zedong
- swamp wildlife Marsh and
- Mathematics
- Maya
- Medicine
- Mathematics
- Machines 327- M
- Medicine, history of 338-
- Medieval Europe 340-
- Metals
- Mexico 343-
- Microscopes
- Microscopic life
- Middle East 347-
- Migration, animal
- Money
- Medieval Europe 340-
- Mongol Empire
- apes 353- Monkeys and
- Moon
- and ferns Mosses, liverworts,
- Mountains
- Mountain wildlife
- Movies 359-
- Muhammad
- Muscles and movement
- and other fungi Mushrooms, toadstools,
- Music 364-
- 366- Musical instruments
- Music 364-
- Myths and legends
- Napoleon Bonaparte N • O
- National parks
- 371- Native Americans
- Navigation
- Nests and burrows
- New Zealand 375-
- National parks
- and other fungi Mushrooms, toadstools,
- New Zealand, history of
- Normans
- North Africa 379-
- North America 381-
- Nuclear energy
- Numbers
- 387- Oceans and seas
- Numbers
- Ocean wildlife 389-
- Nuclear energy
- Octopuses and squid
- Oil
- Olympic Games
- Ottoman Empire
- Oxygen
- Pacific Ocean 396- P
- Painters 398-
- Painting 400-
- Persians, Ancient
- Phoenicians
- Photography 404-
- Physics
- Pilgrims
- Pirates
- Planets 409-
- Plants 411-
- Plastics
- Plants 411-
- Planets 409-
- Pirates
- Polar wildlife 414-
- Political parties
- Pollution 417-
- Political parties
- Ports and waterways
- Portugal 420-
- Prehistoric life 422-
- Prehistoric peoples
- Presidency
- Radio R
- Radioactivity
- Rain and snow
- Reformation
- Religions 430-
- Renaissance 432-
- Reproduction 434-
- Reptiles 436-
- Rivers
- Robots
- Reptiles 436-
- Rockets and missiles
- Prehistoric peoples
- Rocks and minerals 441-
- Roman Empire 443-
- Delano Roosevelt, Franklin
- Russian Federation 446-
- Russian Revolution
- Satellites S
- Scandinavia 452-
- Science
- Science, history of 456-
- Seashore wildlife 458-
- Shakespeare, William
- Sharks and rays
- Shells and shellfish
- Ships and boats 463-
- Skeletons 465-
- Slavery 467-
- Snails and slugs
- Snakes
- Soccer
- Soil
- Sound
- South Africa 474-
- South America 476-
- 480- South America, history of
- Southeast Asia 482-
- 486- Southeast Europe, Central
- Mediterranean 488- Southeast Europe,
- Skeletons 465-
- Southern Africa 490-
- 492- Soviet Union, history of
- Space flight 494-
- Spain 496-
- Spiders and scorpions
- Sports 501-
- Stars 503-
- Statue of Liberty
- Stone Age
- Storms
- Stars 503-
- Submarines
- Sumerians
- Sun
- Sumerians
- Supreme Court
- Switzerland
- Technology 513- T
- Teeth
- Telephones
- Telescopes
- Television 518-
- Theater 520-
- Time
- Tornadoes and hurricanes
- 524- Trade and industry
- Trains 526-
- 528- Transportation, history of
- Trees 530-
- Time
- Theater 520-
- Tubman, Harriet
- Turkey 533-
- Ukraine U • V • W
- Turkey 533-
- United Kingdom 536-
- 540- United Kingdom, history of
- United Nations
- 543- United States of America
- 547- United States, history of
- Universe
- Victorians 550-
- Vietnam War
- Vikings
- Volcanoes
- Washington, George
- Water 556-
- Weather 558-
- Weights and measures
- Vietnam War
- West Africa 561-
- Western expansion
- Whales and dolphins 566-
- Wheels
- Wind
- Women’s rights 570-
- world Wonders of the ancient
- World War I 573-
- World War II 575-
- Worms
- 578- Writers and poets
- X-rays X • Z
- Zoos
- INDEX 582–
- Gazetteer 594-
- 597– ACKNOWLEDGMENTS
- Worms
- Wheels
- Technology 513- T
- Switzerland
- Spain 496-
- Russian Revolution
- Roman Empire 443-
- Prehistoric life 422-
- Portugal 420-
- Movies 359-
- apes 353- Monkeys and