NaN/100 votes#1 - How Two Microbes Changed History
Season 2 Episode 1 - Aired 1/15/2018
What if I told you that, more than two billion years ago, some tiny living thing started to live inside another living thing … and never left? And now, the descendants of both of those things are in you?
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#2 - The Time Terror Birds Invaded
Season 2 Episode 2 - Aired 1/22/2018
About 5 million years ago, a new predator made its way from the south and onto the coastal plains of North America. It was a giant, flightless, carnivorous bird and came to be known by one of the coolest and most richly earned nicknames in all of paleontology: the terror bird.
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#3 - Untangling the Devil's Corkscrew
Season 2 Episode 3 - Aired 1/29/2018
In the late 1800s, paleontologists in Nebraska found huge coils of hardened sand stuck deep in the earth. Local ranchers called them Devil's Corkscrews and scientists called them Daemonelix. It was clear these corkscrews were created by some form of life, but what?
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#4 - The Great Snake Debate
Season 2 Episode 4 - Aired 2/5/2018
90 million years ago, an ancient snake known as Najash had...legs. It is by no means the only snake to have limbs either. But what’s even stranger: we’re not at all sure where it came from.
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#5 - The Whole Saga of the Supercontinents
Season 2 Episode 5 - Aired 2/12/2018
The study of natural history is the study of how the world has changed but Earth itself is in a constant state of flux -- because the ground beneath your feet is always moving. So if we want to know how we got here, we have to understand how "here" got here.
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#6 - From the Cambrian Explosion to the Great Dying
Season 2 Episode 6 - Aired 2/20/2018
The first era of our current eon, the Paleozoic Era, is probably the most deceptively fascinating time in Earth’s history. With near constant revolutions in life, punctuated by catastrophic extinctions, it is also one of the most chaotic.
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#7 - How Sex Became a Thing
Season 2 Episode 7 - Aired 2/26/2018
We don’t know which living thing was the very first to arrive at the totally revolutionary process that is sexual reproduction but we can follow the history of how (and why) sex became a thing.
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#8 - The Other Explosion You Should Know About
Season 2 Episode 8 - Aired 3/5/2018
Fossils found around the world suggest that multi-cellular life was not only present before the Cambrian Explosion, it was much more elaborate and diverse than anyone thought. This is the story of the sudden burst of diversity that marked the dawn of truly complex life on our planet.
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#9 - How the Turtle Got Its Shell
Season 2 Episode 9 - Aired 3/12/2018
Where did turtles come from? And how did the they get their shells? The answers to these questions would eventually cause scientists to rethink the entire history of reptile evolution.
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#10 - What a Dinosaur Looks Like Under a Microscope
Season 2 Episode 10 - Aired 3/19/2018
We traveled to Bozeman, Montana to meet with Dr. Ellen-Thérèse Lamm who explores ancient life by studying it at the cellular level. Kallie and Dr. Lamm discuss how she does this, and what she’s learned by putting dinosaur bones under a microscope.
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#11 - The Most Useful Fossils in the World
Season 2 Episode 11 - Aired 3/26/2018
For decades, one of the most abundant kinds of fossils on Earth, numbering in the millions of specimens, was a mystery to paleontologists. But geologists discovered that these mysterious fossils could basically be used to tell time in the deep past.
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#12 - Inside the Dinosaur Library
Season 2 Episode 12 - Aired 4/2/2018
We're back in Bozeman, Montana this week talking to Amy Atwater, Collections Manager at the Museum of the Rockies. MOR has among the largest collections of North American dinosaurs in the United States. We talk to Amy about her job and the collection she manages.
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#13 - What Was the Ancestor of Everything?
Season 2 Episode 13 - Aired 4/11/2018
The search for our origins go back to a single common ancestor -- one that remains shrouded in mystery. It’s the ancestor of everything we know and today scientists call it the last universal common ancestor, or LUCA.
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#14 - How the Squid Lost Its Shell
Season 2 Episode 14 - Aired 4/17/2018
The ancestors of modern, squishy cephalopods like the octopus and the squid all had shells. In ancient times, their shell was their greatest asset but it eventually proved to be their biggest weakness.
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#15 - How the Chalicothere Split In Two
Season 2 Episode 15 - Aired 4/24/2018
Two extinct relatives of horses and rhinos are closely related to each other but have strikingly different body plans. How did two of the same kind of animal, living in the same place, end up looking so different?
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#16 - The Age of Reptiles in Three Acts
Season 2 Episode 16 - Aired 5/2/2018
Reptiles emerged from the Paleozoic as humble creatures, but in time, they grew to become some of the largest forms of life ever to stomp, swim, and soar across the planet. This Age of Reptiles was a spectacular prehistoric epic, and it all took place in a single era: the Mesozoic.
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#17 - The Weird, Watery Tale of Spinosaurus
Season 2 Episode 17 - Aired 5/8/2018
In 1912, a fossil collector discovered some strange bone fragments in the eerie, beautiful Cretaceous Bahariya rock formation of Egypt. Eventually, that handful of fossil fragments would reveal to scientists one of the strangest dinosaurs that ever existed -- the world’s only known semi-aquatic dinosaur.
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#18 - From the Fall of Dinos to the Rise of Humans
Season 2 Episode 18 - Aired 5/16/2018
After taking you on a journey through geologic time, we've arrived at the Cenozoic Era. Most of the mammals and birds that you can think of appeared during this era but perhaps more importantly, the Cenozoic marks the rise of organisms that look a lot like us.
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#19 - That Time It Rained for Two Million Years
Season 2 Episode 19 - Aired 5/22/2018
At the beginning of the Triassic Period, with the continents locked together from pole-to-pole in the supercontinent of Pangea, the world is hot, flat, and very, very dry. But then 234 million years ago, the climate suddenly changed for the wetter.
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#20 - Why Triassic Animals Were Just the Weirdest
Season 2 Episode 20 - Aired 6/5/2018
The Triassic was full of creatures that look a lot like other, more modern species, even though they’re not closely related at all. The reason for this has to do with how evolution works and with the timing of the Triassic itself: when life was trapped between two mass extinctions.
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#21 - Where Did Viruses Come From?
Season 2 Episode 21 - Aired 6/12/2018
There are fossils of viruses, of sorts, preserved in the DNA of the hosts that they’ve infected. Including you. This molecular fossil trail can help us understand where viruses came from, how they evolved and it can even help us tackle the biggest question of all: Are viruses alive?
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#22 - When Fish First Breathed Air
Season 2 Episode 22 - Aired 6/19/2018
385 million years ago, a group of fish would undertake one of the most important journeys in the history of life and become the first vertebrates to live on dry ground. But first, they had to acquire the ability to breathe air.
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#23 - How the T-Rex Lost Its Arms
Season 2 Episode 23 - Aired 6/26/2018
Tyrannosaurus rex was big, Tyrannosaurus rex was vicious, and Tyrannosaurus rex had tiny arms. The story of how T-Rex lost its arms is, itself, pretty simple. But the story of why it kept those little limbs, and how it used them? Well, that’s a little more complicated.
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#24 - FAQs From Our First Year
Season 2 Episode 24 - Aired 7/3/2018
Over the first season of PBS Eons, we’ve explored the history of Earth from the very origins of life right up to the Cenozoic Era that we’re in now. To celebrate our first anniversary together, we’d like to answer some of your most frequently asked questions.
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#25 - When Insects First Flew
Season 2 Episode 25 - Aired 7/10/2018
Insects were the first animals to ever develop the ability to fly, and, arguably, they did it the best. But this development was so unusual that scientists are still/working on, and arguing about, how and when insect wings first came about.
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The Best Episodes of Eons Season 2
Every episode of Eons Season 2 ranked from best to worst. Discover the Best Episodes of Eons Season 2!
Join hosts Hank Green, Kallie Moore, and Blake de Pastino as they take you on a journey through the history of life on Earth. From...
Genre:Documentary
Season 2 Ratings Summary
"How Two Microbes Changed History" is the best rated episode of "Eons" season 2. It scored N/A/10 based on 0 votes. Directed by N/A and written by N/A, it aired on 1/15/2018. This episode is rated NaN points higher than the second-best, "The Time Terror Birds Invaded".