S1 E1 - The Trouble With Trilobites

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!

Jun 26, 2017 • 10m

S1 E2 - When Did the First Flower Bloom?

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.

Jul 3, 2017 • 10m

S1 E3 - The Tully Monster & Other Problematic Creatures

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.

Jul 11, 2017 • 10m

S1 E4 - Stegosaurs: Tiny Brains & Thagomizers

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.

Jul 17, 2017 • 10m

S1 E5 - What Colors Were Dinosaurs?

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

Jul 24, 2017 • 10m

S1 E6 - The Story of Saberteeth

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.

Jul 31, 2017 • 10m

S1 E7 - That Time Oxygen Almost Killed Everything

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.

Aug 7, 2017 • 10m

S1 E8 - The Biggest Thing That Ever Flew

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.

Aug 14, 2017 • 10m

S1 E9 - Dimetrodon: Our Most Unlikely Ancestor

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.

Aug 21, 2017 • 10m

S1 E10 - The Extinction That Never Happened

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.

Aug 28, 2017 • 10m

S1 E11 - The Strange Case of the Buzzsaw Jaws

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.

Sep 11, 2017 • 10m

S1 E12 - The Age of Giant Insects

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.

Sep 18, 2017 • 10m

S1 E13 - History's Most Powerful Plants

Fossil fuels are made from the remains of extinct organisms that have been exposed to millions of years of heat and pressure. But in the case of coal, these organisms consisted largely of some downright bizarre plants that once covered the Earth, from Colorado to China.

Sep 26, 2017 • 10m

S1 E14 - How Did Dinosaurs Get So Huge?

Part of why we’re so fascinated with extinct dinosaurs it’s just hard for us to believe that animals that huge actually existed. And yet, they existed! From the Jurassic to the Cretaceous Periods, creatures as tall as a five-story building were shaking the Earth.

Oct 2, 2017 • 10m

S1 E15 - When The Earth Was Purple

Besides the blue of the oceans, the dominant color of our planet, as we know it, is green. But imagine a time when the Earth looked a little … purple.

Oct 9, 2017 • 10m

S1 E16 - 'Living Fossils' Aren't Really a Thing

Crocodiles, horseshoe crabs and tuatara are animals that have persisted for millions of years, said to have gone unchanged since the days of the dinosaurs. But even the most ancient-looking organisms show us that evolution is always at work.

Oct 16, 2017 • 10m

S1 E17 - When Whales Walked

We know whales as graceful giants bound to the sea. But what if we told you there was actually a time when whales could walk.

Oct 23, 2017 • 10m

S1 E18 - An Illustrated History of Dinosaurs

Our image of dinosaurs has been constantly changing since naturalists started studying them about 350 years ago. Taken together, these pictures can tell us a whole lot about just how much we have learned. Let's explore the history of dinosaur science as seen through the history of dinosaur art.

Oct 30, 2017 • 10m

S1 E19 - A Brief History of Geologic Time

By looking at the layers beneath our feet, geologists have been able to identify and describe crucial episodes in life’s history. These key events frame the chapters in the story of life on earth and the system we use to bind all these chapters together is the Geologic Time Scale.

Nov 6, 2017 • 10m

S1 E20 - The Search for the Earliest Life

More than 4 billion years ago, the crust of the Earth was still cooling and the oceans were only beginning to form. But in recent years, we’ve started to discover that, even in this hellish environment, life found a way.

Nov 20, 2017 • 10m

S1 E21 - The Facts About Dinosaurs & Feathers

Over the past 20 years, dinosaurs of all types and sizes have been found with some sort of fluff or even full-on plumage. These fuzzy discoveries have raised a whole batch of new questions so we're here to tell you everything we know about dinosaurs and feathers.

Nov 27, 2017 • 10m

S1 E22 - The Last Time the Globe Warmed

Imagine an enormous, lush rainforest teeming with life...in the Arctic. Well there was a time -- and not too long ago -- when the world warmed more than any human has ever seen. (So far)

Dec 4, 2017 • 10m

S1 E23 - What Happened to the World's Greatest Ape?

Probably twice the size of a modern gorilla, Gigantopithecus is the greatest great-ape that ever was. And for us fellow primates, there are some lessons to be learned in how it lived, and why it disappeared.

Dec 11, 2017 • 10m

S1 E24 - When Giant Fungi Ruled

420 million years ago, a giant feasted on the dead, growing slowly into the largest living thing on land. It belonged to an unlikely group of pioneers that ultimately made life on land possible -- the fungi.

Dec 18, 2017 • 10m