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Season 1 Episode 19 | 12m 8s
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.
Aired: 02/15/18
Video has closed captioning.
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.
Your Place in the Primate Family Tree
How did we get from a mouse-sized creature that looked more like a squirrel to you?
Scientists have been working for decades to unlock the genetic secrets of the past.
Is LH PV18 a Tarbosaurus bataar? Or a different theropod named Raptorex kriegsteini?
Human ancestors were already walking 3.6 million years ago. But who was first to walk?
Life, Sex & Death Among the Dire Wolves
Dire wolves were real! Their remains taught us a lot about how they lived.
How a Supervolcano Made the Cenozoic’s Coolest Fossils
Yellowstone contains some of North America's most amazing fossil deposits.
How Horses Took Over North America (Twice)
Horses vanished from North America for 10,000 years until a mammal brought them back.
420 million years ago, some fish wore armor – and it may have served a surprising purpose.
The Last Time the Globe Warmed
Imagine an enormous, lush rainforest teeming with life...in the Arctic.
The Whole Saga of the Supercontinents
So if we want to know how we got here, we have to understand how "here" got here.
From the Cambrian Explosion to the Great Dying
The Paleozoic Era is one of the most chaotic times in Earth's history. Find out why!
From the Fall of Dinos to the Rise of Humans
The Cenozoic marks the rise of organisms that look a lot like us.
