- Why Would Early Earth Have Been Toxic for Modern Day Animals?Biology
- When Were Eyes Invented? The Evolution of VisionBiology
- How Many Phyla Are There in the Tree of Life?Biology
- Where Did Termites Come From? Their Evolutionary OriginsBugs
- Are Chordates Deuterostomes? Explaining the EvidenceZoology
- When Did the Late Devonian Extinction Occur?Earth & Space
- Why Do We Have 10 Fingers? The Evolution of PentadactylyBiology
- Can We Bring Back Neanderthals? The Science and EthicsGenetics
- Which Plants Evolved First? The History of Plant LifeBotany
- Why Did the Hohokam Disappear From Their Settlements?Earth & Space
- How Old Are Clovis Points? The Science of Dating ThemEarth & Space
- What Is a Protosome? Key Developmental FeaturesBiology
- How Did James Hutton Contribute to the Theory of Evolution?Earth & Space
- When Did Vascular Plants Evolve and Change the World?Botany
- When Did the First Photosynthesis Evolve?Biology
- What Caused the Late Devonian Extinction?Earth & Space
- How Long Have Crabs Existed? An Evolutionary HistoryAquatic
- Where Did the First Seed Come From? The Evolution of PlantsBotany
- How Long Have Trees Existed? An Evolutionary HistoryBotany
- How Did Ground Sloths Go Extinct? A Scientific LookEarth & Space
- When Did Sponges Evolve? Fossil and Molecular EvidenceAquatic
- Why Were Prokaryotes the First Cells on Earth?Biology
- How Did the First Cell Form on Early Earth?Biology
- Does the Anus Form First? Two Paths of Animal DevelopmentZoology
- How Long Have Trees Been Around? An Evolutionary HistoryTrees & Shrubs
- The Cambrian Climate and the Explosion of LifeEarth & Space
- What Caused the Eocene-Oligocene Extinction Event?Earth & Space
- David Raup: The Paleontologist Who Redefined EvolutionBiology
- Blastopore: Its Fundamental Role in Animal DevelopmentZoology
- Middle Pleistocene: The Age of Ice, Megafauna, and HumansEarth & Space