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Eons
Season 3 • Episode 2 • How Blood Evolved (Many Times)
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Eons Season 3, Episode 2: How Blood Evolved (Many Times)
Blood is one of the most revolutionary features in our evolutionary history. Over hundreds of millions of years, the way in which blood does its job has changed over and over again. As a result, we animals have our familiar red blood. But also blue blood. And purple, and green, and even white. Watch Eons Season 3, Episode 2 How Blood Evolved (Many Times) in HD free online. Enjoy high-quality streaming of Eons Season 3, Episode 2 and share your thoughts in the comments below!
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Episodes
39 episodesWhen Humans Were Prey
Not too long ago, our early human ancestors were under constant threat of attack from predators. And it turns out that this difficult chapter in our history may be responsible for the adaptations that allowed us to become so successful.
10 min
How Blood Evolved (Many Times)
Blood is one of the most revolutionary features in our evolutionary history. Over hundreds of millions of years, the way in which blood does its job has changed over and over again. As a result, we animals have our familiar red blood. But also blue blood. And purple, and green, and even white.
10 min
The Humans That Lived Before Us
As more and more fossil ancestors have been found, our genus has become more and more inclusive, incorporating more members that look less like us, Homo sapiens. By getting to know these other hominins--the ones who came before us--we can start to answer some big questions about what it essentially means to be human.
10 min
The Island of Shrinking Mammoths
The mammoths fossils found on the Channel Islands off the coast of southern California are much smaller than their relatives found on the mainland. They were so small that they came to be seen as their own species. How did they get there? And why were they so small?
10 min
The Evolution of the Heart (A Love Story)
In order to understand where hearts came from, we have to go back to the earliest common ancestor of everything that has a heart. It took hundreds of millions of years, and countless different iterations of the same basic structure to lead to the heart that you have today.
10 min
How 7,000 Years of Epic Floods Changed the World
Strange geologic landmarks in the Pacific Northwest are the lingering remains of a mystery that took nearly half a century to solve. These features turned out to be a result one of the most powerful and bizarre episodes in geologic history: this region experienced dozens of major, devastating floods over the course of more than 7,000 years.
10 min
The Island of Huge Hamsters and Giant Owls
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10 min
The Giant Bird That Got Lost in Time
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10 min
When We First Made Tools
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10 min
When Giant Scorpions Swarmed the Seas
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10 min
When We Tamed Fire
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10 min
The Mystery Behind the Biggest Bears of All Time
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10 min
The Croc That Ran on Hooves
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10 min
When We Took Over the World
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10 min
The Ghostly Origins of the Big Cats
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10 min
The History of Climate Cycles (and the Woolly Rhino) Explained
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10 min
The Hellacious Lives of the "Hell Pigs"
Despite the name, we don’t know where the so-called “hell pigs” belong in the mammalian family tree. They walked on hooves, like pigs do, but had longer legs, almost like deer. They had hunched backs, a bit like rhinos or bison. But as is often, if not always, the case, there is some evolutionary method to this anatomical madness.
10 min
How Evolution Works (And How We Figured It Out)
As a scientific concept, evolution was revolutionary when it was first introduced. With the help of all three of our hosts and the Smithsonian National Museum of Natural History’s new Deep Time Hall, we’ll try to explain how evolution actually works and how we came to understand it.
10 min
When the Synapsids Struck Back
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10 min
When Ichthyosaurs Led a Revolution in the Seas
The marine reptiles Ichthyosaurs arose after The Great Dying, which wiped out at least 90 percent of life in the oceans, changing the seas forever and triggering a new evolutionary arms race between predator and prey.
10 min
When We Met Other Human Species
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10 min
How Volcanoes Froze the Earth (Twice)
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10 min
How Earth's First, Unkillable Animals Saved the World
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10 min
When Giant Deer Roamed Eurasia
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10 min
Was This Dinosaur a Cannibal?
Paleontologists have spent the better part of two decades debating whether Coelophysis ate its own kind. It turns out, the evidence that scientists have had to study in order to answer that question includes some of the strangest and grossest fossils that any expert would ever get to see.
10 min
The Missing Link That Wasn’t
The myth of the Missing Link--the idea that there must be a specimen that partly resembles an ape but also partly resembles a modern human--is persistent. But the reality is that there is no missing link in our lineage, because that’s not how evolution works.
10 min
The Raptor That Made Us Rethink Dinosaurs
In 1964, a paleontologist named John Ostrom unearthed some fascinating fossils from the mudstone of Montana. Its discovery set the stage for what’s known today as the Dinosaur Renaissance, a total re-thinking of what we thought we knew about dinosaurs.
10 min
When Bats Took Flight
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10 min
How Pterosaurs Got Their Wings
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10 min
When Giant Lemurs Ruled Madagascar
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10 min
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10 min
The Case of the Dinosaur Egg Thief
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10 min
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10 min
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10 min
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10 min
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10 min
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10 min
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10 min