| Introduction | p. 1 |
| How Life Began | |
| Fossils Prove Life Came About Faster | p. 8 |
| Clues to Fiery Origin of Life Sought in Hothouse Microbes | p. 11 |
| Evidence Puts Date for Life's Origin Back Millions of Years | p. 17 |
| The Comet's Gift: Hints of How Earth Came to Life | p. 20 |
| Evidence Backs Theory Linking Origins of Life to Volcanoes | p. 25 |
| From Dinosaurs to Birds | |
| Fossil of a Terror That Dwarfed T. Rex Is Found | p. 33 |
| Computer Recreates Call of Dinosaur Sound Organ | p. 37 |
| New Dinosaur Exhibit Underscores Disputes Within Paleontology | p. 40 |
| Familiar Dinosaurs May Take New Shape | p. 45 |
| Chemical Traces of Blood Found in Bones of Tyrannosaurus Rex | p. 48 |
| Pity a Tyrannosaur? Sue Had Gout | p. 51 |
| Embryo Sheds Light on Dinosaurs' Origin | p. 54 |
| Fossil of Nesting Dinosaur Strengthens Link to Modern Birds | p. 58 |
| In China, a Spectacular Trove of Dinosaur Fossils Is Found | p. 62 |
| An Early Bird Mars Theory on Dinosaurs | p. 65 |
| Fossil Find Hints at Origin of Flight | p. 68 |
| Global Catastrophes | |
| New Clues to Agent of Life's Worst Extinction | p. 73 |
| Mass Extinction of Permian Era Linked to a Gas | p. 80 |
| Asteroid's Shallow Angle May Have Sent Inferno Over Northern Kill Zone | p. 86 |
| Milestones in Evolution | |
| Three Finds Clarify Life's Murky Origins | p. 95 |
| First Branch in Life's Tree Was Two Billion Years Ago | p. 100 |
| Using Genes as a Clock, Study Traces Animal Life Back a Billion Years | p. 104 |
| Evidence of Bone Shows Vertebrates to Be Far Older Than Once Believed | p. 108 |
| Early Amphibian Fossil Hints of a Trip Ashore Earlier Than Thought | p. 111 |
| Animals Left the Water Earlier Than Thought | p. 115 |
| Long Before Flowering Plants, Insects Evolved Ways to Use Them | p. 117 |
| Which Came First: Bees or Flowers? Find Points to Bees | p. 125 |
| Stories from the Fossil Record | |
| Reconstructing a Galloping Crocodile After a Mere 200 Million Years | p. 131 |
| Legged Snakes? First Reliable Evidence Is In | p. 134 |
| Galapagos Mystery Solved: Fauna Evolved on Vanished Isle | p. 137 |
| How the Whale Lost Its Legs and Returned to the Sea | p. 143 |
| Treasure Trove of Fossils Turns Up in the Gobi | p. 149 |
| Expedition to Far New Jersey Finds Trove of Amber Fossils | p. 154 |
| Reservoir of Living Fossils May Lie Below Ice | p. 158 |
| Clash on Fossil Sales Shadows a Trade Fair | p. 160 |
| "Dwarf" Mammoths May Have Put Off Demise | p. 166 |
| Horses, Mollusks and the Evolution of Bigness | p. 169 |
| The Wizard of Eyes: Evolution Creates Novelty by Varying the Same Old Tricks | p. 174 |
| The Emergence of Humans | |
| New Fossils Take Science Close to Dawn of Humans | p. 182 |
| Tiny Foot Bones May Show a Giant Leap for Mankind | p. 187 |
| New Fossils Reveal the First of Man's Walking Ancestors | p. 191 |
| The Transforming Leap, From Four Legs to Two | p. 196 |
| Fossil Family: Big Guys Join Delicate Lucy | p. 204 |
| Skull in Ethiopia Is Linked to Earliest Man | p. 207 |
| Toolmaker's Thumb Not Unique to Humans | p. 211 |
| Human Ancestors' Earliest Tools Found in Africa | p. 216 |
| Bones in China Put New Light on Old Humans | p. 220 |
| Neanderthals and Modern Humans Co-existed Longer Than Thought | p. 225 |
| Fossils Called Limb in Human Family Tree | p. 228 |
| Three Human Species Co-existed Eons Ago, New Data Suggest | p. 231 |
| Neanderthal DNA Sheds New Light on Human Origins | p. 235 |
| The Latest from the Field | |
| Across a Great Divide of Biology | p. 242 |
| Life's Origins Get Murkier and Messier | p. 246 |
| Skulls on the Out-of-Africa Trail | p. 251 |
| To People the World, Start with 500 | p. 254 |
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