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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 the dawn of life in the Archaean Eon through the

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  1. #1 Fan Favorite
    Eons Season 2 Episode 1 - How Two Microbes Changed History
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    #1 - How Two Microbes Changed History

    S2:E1

    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?

    Director:Unknown
    Writer:Unknown

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  2. Eons Season 2 Episode 2 - The Time Terror Birds Invaded
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    #2 - The Time Terror Birds Invaded

    S2:E2

    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.

    Director:Unknown
    Writer:Unknown

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  3. Eons Season 2 Episode 3 - Untangling the Devil's Corkscrew
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    #3 - Untangling the Devil's Corkscrew

    S2:E3

    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?

    Director:Unknown
    Writer:Unknown

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  4. Eons Season 2 Episode 4 - The Great Snake Debate
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    #4 - The Great Snake Debate

    S2:E4

    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.

    Director:Unknown
    Writer:Unknown

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  5. Eons Season 2 Episode 5 - The Whole Saga of the Supercontinents
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    #5 - The Whole Saga of the Supercontinents

    S2:E5

    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.

    Director:Unknown
    Writer:Unknown

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  6. Eons Season 2 Episode 6 - From the Cambrian Explosion to the Great Dying
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    #6 - From the Cambrian Explosion to the Great Dying

    S2:E6

    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.

    Director:Unknown
    Writer:Unknown

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  7. Eons Season 2 Episode 7 - How Sex Became a Thing
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    #7 - How Sex Became a Thing

    S2:E7

    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.

    Director:Unknown
    Writer:Unknown

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  8. Eons Season 2 Episode 8 - The Other Explosion You Should Know About
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    #8 - The Other Explosion You Should Know About

    S2:E8

    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.

    Director:Unknown
    Writer:Unknown

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  9. Eons Season 2 Episode 9 - How the Turtle Got Its Shell
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    #9 - How the Turtle Got Its Shell

    S2:E9

    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.

    Director:Unknown
    Writer:Unknown

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  10. Eons Season 2 Episode 10 - What a Dinosaur Looks Like Under a Microscope
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    #10 - What a Dinosaur Looks Like Under a Microscope

    S2:E10

    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.

    Director:Unknown
    Writer:Unknown

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  11. Eons Season 2 Episode 11 - The Most Useful Fossils in the World
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    #11 - The Most Useful Fossils in the World

    S2:E11

    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.

    Director:Unknown
    Writer:Unknown

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  12. Eons Season 2 Episode 12 - Inside the Dinosaur Library
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    #12 - Inside the Dinosaur Library

    S2:E12

    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.

    Director:Unknown
    Writer:Unknown

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  13. Eons Season 2 Episode 13 - What Was the Ancestor of Everything?
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    #13 - What Was the Ancestor of Everything?

    S2:E13

    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.

    Director:Unknown
    Writer:Unknown

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  14. Eons Season 2 Episode 14 - How the Squid Lost Its Shell
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    #14 - How the Squid Lost Its Shell

    S2:E14

    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.

    Director:Unknown
    Writer:Unknown

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  15. Eons Season 2 Episode 15 - How the Chalicothere Split In Two
    0.0/10(0 votes)

    #15 - How the Chalicothere Split In Two

    S2:E15

    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?

    Director:Unknown
    Writer:Unknown

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  16. Eons Season 2 Episode 16 - The Age of Reptiles in Three Acts
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    #16 - The Age of Reptiles in Three Acts

    S2:E16

    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.

    Director:Unknown
    Writer:Unknown

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  17. Eons Season 2 Episode 17 - The Weird, Watery Tale of Spinosaurus
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    #17 - The Weird, Watery Tale of Spinosaurus

    S2:E17

    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.

    Director:Unknown
    Writer:Unknown

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  18. Eons Season 2 Episode 18 - From the Fall of Dinos to the Rise of Humans
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    #18 - From the Fall of Dinos to the Rise of Humans

    S2:E18

    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.

    Director:Unknown
    Writer:Unknown

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  19. Eons Season 2 Episode 19 - That Time It Rained for Two Million Years
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    #19 - That Time It Rained for Two Million Years

    S2:E19

    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.

    Director:Unknown
    Writer:Unknown

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  20. Eons Season 2 Episode 20 - Why Triassic Animals Were Just the Weirdest
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    #20 - Why Triassic Animals Were Just the Weirdest

    S2:E20

    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.

    Director:Unknown
    Writer:Unknown

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  21. Eons Season 2 Episode 21 - Where Did Viruses Come From?
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    #21 - Where Did Viruses Come From?

    S2:E21

    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?

    Director:Unknown
    Writer:Unknown

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  22. Eons Season 2 Episode 22 - When Fish First Breathed Air
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    #22 - When Fish First Breathed Air

    S2:E22

    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.

    Director:Unknown
    Writer:Unknown

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  23. Eons Season 2 Episode 23 - How the T-Rex Lost Its Arms
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    #23 - How the T-Rex Lost Its Arms

    S2:E23

    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.

    Director:Unknown
    Writer:Unknown

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  24. Eons Season 2 Episode 24 - FAQs From Our First Year
    0.0/10(0 votes)

    #24 - FAQs From Our First Year

    S2:E24

    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.

    Director:Unknown
    Writer:Unknown

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  25. Eons Season 2 Episode 25 - When Insects First Flew
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    #25 - When Insects First Flew

    S2:E25

    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.

    Director:Unknown
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Season 2 Ratings Summary

"How Two Microbes Changed History" is the best rated episode of "Eons" season 2. It scored /10 based on 0 votes. Directed by Unknown and written by Unknown, it aired on 1/15/2018. This episode is rated 0.0 points higher than the second-best, "The Time Terror Birds Invaded".