Season 1
The Two People We're All Related To
Two humans managed to pass on a very small fraction of their genomes to all of us.
The Two People We're All Related To
Your Place in the Primate Family Tree
How did we get from a mouse-sized creature that looked more like a squirrel to you?
Your Place in the Primate Family Tree
Scientists have been working for decades to unlock the genetic secrets of the past.
Can We Get DNA From Fossils?
Is LH PV18 a Tarbosaurus bataar? Or a different theropod named Raptorex kriegsteini?
Did Raptorex Really Exist?
Human ancestors were already walking 3.6 million years ago. But who was first to walk?
When We First Walked
Life, Sex & Death Among the Dire Wolves
Dire wolves were real! Their remains taught us a lot about how they lived.
Life, Sex & Death Among the Dire Wolves
How a Supervolcano Made the Cenozoic’s Coolest Fossils
Yellowstone contains some of North America's most amazing fossil deposits.
How a Supervolcano Made the Cenozoic’s Coolest Fossils
How Horses Took Over North America (Twice)
Horses vanished from North America for 10,000 years until a mammal brought them back.
How Horses Took Over North America (Twice)
How did Archaeopteryx relate to today’s birds? Its teeth provide a major clue.
When Birds Had Teeth
420 million years ago, some fish wore armor – and it may have served a surprising purpose.
When Fish Wore Armor
The Mystery of the Eocene’s Lethal Lake
In the 1800s, miners found beautifully preserved fossils of animals from the Eocene.
The Mystery of the Eocene’s Lethal Lake
Insects were the first animals to fly. Scientists are still working on how it happened.
When Insects First Flew
To celebrate our first anniversary together, we’d like to answer some of your questions.
FAQs From Our First Year
Tyrannosaurus rex had tiny arms. How did this happen, and why did it keep them?
How the T-Rex Lost Its Arms
Before a group of fish could live on dry land, they acquired the ability to breathe air.
When Fish First Breathed Air
Where did viruses come from and how did they evolve? Are viruses alive?
Where Did Viruses Come From?
Why Triassic Animals Were Just the Weirdest
Why the Triassic was full of creatures that look a lot like other, more modern species.
Why Triassic Animals Were Just the Weirdest
That Time It Rained for Two Million Years
234 million years ago, the climate suddenly changed for the wetter.
That Time It Rained for Two Million Years
From the Fall of Dinos to the Rise of Humans
The Cenozoic marks the rise of organisms that look a lot like us.
From the Fall of Dinos to the Rise of Humans
The Weird, Watery Tale of Spinosaurus
In 1912, a fossil collector discovered the world’s only known semi-aquatic dinosaur.
The Weird, Watery Tale of Spinosaurus
The Age of Reptiles in Three Acts
Reptiles in time grew to become some of the largest forms of life ever to exist on earth.
The Age of Reptiles in Three Acts
How the Chalicothere Split In Two
How did two of the same kind of animal end up looking so different?