EONS explores the history of life on Earth, from the dawn of life in the Archaean Eon though the Mesozoic Era - the so-called "Age of Dinosaurs" - right up to the end of the most recent Ice Age. Hank Green hosts, alongside paleontologist Kallie Moore and science writer Blake de Pastino. They discuss the evolutionary history of mammals, including humans and other species.

  • The Trouble With Trilobites | Eons

    Trilobites are famous not just because they were so beautifully functional, or because they happened to preserve so well. They’re known the world over because they were everywhere!

    Grades: 9-12
  • When Did the First Flower Bloom? | Eons

    During the Cretaceous Period, dinosaurs were more diverse, more fierce, and more strange than ever. But something else was happening under the feet of the terrible lizards: for the first time in history, there were flowers.

    Grades: 9-12
  • The Tully Monster & Other Problematic Creatures | Eons

    There are animals in the fossil record that challenge some of our most basic ideas about what animals are supposed to look like. If there ever was a monster on this planet that was worthy of the name, it might have been the Tully Monster.

    Grades: 9-12
  • Stegosaurs: Tiny Brains & Thagomizers | Eons

    If you take it as a given that extinct dinosaurs were all weird and wonderful, then you gotta at least consider that Stegosaurus was one of the weirdest and wonderfulest.

    Grades: 9-12
  • What Colors Were Dinosaurs? | Eons

    We know a lot about dinosaurs but there’s one question that has plagued paleontologists for decades: what color were they?

    Grades: 9-12
  • The Story of Saberteeth | Eons

    Smilodon was a fearsome Ice Age cat, the size of a modern-day tiger, that had a pair of fangs nearly 18 centimeters long. But it was only the last and largest of the great sabertooths: ridiculously long canines had already been a trend for millions of years by the time Smilodon was prowling around. And you know what? Those giant teeth just might make a comeback.

    Grades: 9-12
  • That Time Oxygen Almost Killed Everything | Eons

    What if we told you that there was a time when oxygen almost wiped out all life on Earth? 3 billion years ago, when the world was a place you’d never recognize, too much of a good thing almost ruined everything for everybody.

    Grades: 9-12
  • The Biggest Thing That Ever Flew | Eons

    Today, we’re familiar with two types of flying vertebrates -- birds and bats. But over 66 million years ago, there was a giraffe-sized reptile that soared through the sky.

    Grades: 9-12
  • Dimetrodon: Our Most Unlikely Ancestor | Eons

    With its lizard-like appearance and that distinctive sail on it back, Dimetrodon is practically the mascot of the Palaeozoic Era, a time before flowers, birds, mammals, and even crocodiles. But if you take a close look at this sail-backed animal, you might see a little bit of yourself.

    Grades: 9-12
  • The Extinction That Never Happened | Eons

    Natural history is full of living things that were long thought to have gone extinct only to show up again, alive and well. Paleontologists have a word for these kinds of organisms: They call them Lazarus taxa.

    Grades: 9-12
  • The Strange Case of the Buzzsaw Jaws | Eons

    There are many fossils that challenge our ability to form even the most basic idea of how a living thing looked, or lived, or functioned. One of the longest-running of these mysteries involved a 270-million-year-old sea creature called Helicoprion that once swam the seas around the supercontinent of Pangea.

    Grades: 9-12
  • The Age of Giant Insects | Eons

    Insects outnumber humans by a lot and we only like to think we're in charge because we're bigger than they are. But insects and other arthropods weren’t always so small. About 315 million years ago during the Carboniferous Period, they were not only abundant: they were enormous.

    Grades: 9-12