TPO 1 1
Groundwater 1
The Origin of the Theater 4
Timberline Vegetation on Mountains 10
TPO 2 14
The Origins of Cetaceans 14
Desert Formation 17
Early Cinema 22
TPO 3 25
Architecture 25
Depletion of the Ogallala Aquifer 28
The Long-term Stability of Ecosystems 31
TPO 4 34
Deer Populations of the Puget Sound 34
Cave Art in Europe 37
Petroleum Resources 40
TPO 5 43
Minerals and Plants 43
The Origin of the Pacific Island People 47
The Cambrian Explosion 52
TPO 6 55
Powering the Industrial Revolution 55
William Smith 58
Infantile Amnesia 60
TPO 7 63
The Geologic History of the Mediterranean 63
Ancient Rome and Greece 66
Agriculture,Iron,and the Bantu Peoples 68
TPO 8 72
The Rise of Teotihuacán 72
Extinction of the Dinosaurs 74
Running Water on Mars 77
TPO 9 80
Colonizing the Americas via the Northwest Coast 80
Reflection in Teaching 82
The Arrival of Plant Life in Hawaii 85
TPO 10 89
Chinese Pottery 89
Variations in the Climate 92
Seventeenth-century European Economic Growth 95
TPO 11 99
Ancient Egyptian Sculpture 99
Orientation and Navigation 102
Begging by Nestlings 105
TPO 12 109
Which Hand Did They Use? 109
Transition to Sound in Films 112
Water in the Desert 117
TPO 13 121
Types of Social Groups 121
Biological Clocks 125
Methods of Studying Infant Perception 129
TPO 14 132
Children and Advertising 132
Maya Water Problems 135
Pastoralism in Ancient Inner Eurasia 138
TPO 15 141
A Warm.blooded Turtle 141
Mass Extinctions 144
Glacier Formation 146
TPO 16 149
Trade and the Ancient Middle East 149
Development of the Periodic Table 156
Planets in Our Solar System 161
TPO 17 167
Europe's Early Sea Trade with Asia 167
Animal Signals in the Rain Forest 174
Symbiotic Relationships 180
TPO 18 186
Industrialization in the Netherlands and Scandinavia 186
The Mystery of Yawning 191
Lightning 194
TPO 19 197
The Roman Army's Impact on Britain 197
Succession，Climax，and Ecosystems 201
Discovering the Ice Ages 205
TPO 20 207
Westward Migration 207
Early Settlements in Southwest Asia 211
Fossil Preservation 215
TPO 21 220
Geothermal Energy 220
The Origins of Agriculture 223
Autobiographical Memory 226
TPO 22 230
Spartina 230
The Birth of Photography 234
The Allende Meteorite 239
TPO 23 243
Urban Climates 243
Seventeenth-century Dutch Agriculture 246
Rock Art of the Australia Aborigines 250
TPO 24 254
Lake Water 254
Breathing During Sleep 255
Moving into Pueblos 259
TPO 25 263
The Surface of Mars 263
The Decline of Venetian Shipping 267
The Evolutionary Origin of Plants 271
TPO 26 275
Energy and the Industrial Revolution 275
Survival of Plants and Animals in Desert Conditions 277
Sumer and the First Cities of the Ancient Near East 282
TPO 27 286
Crafts in theAncient Near East 286
The Formation of Volcanic Islands 289
Predator-prey Cycles 291
TPO 28 295
Groundwater 295
Early Saharan Pastoralists 298
Buck Rubs and Buck Scrapes 301
TPO 29 304
Characteristics of Roman Pottery 304
Competition 307
The History of Waterpower 309
TPO 30 312
Role of Play in Development 312
The Pace of Evolutionary Change 315
The Invention of the Mechanical Clock 319