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Seasons
36. The Conscious Earth
November 21, 2024
Close your exploration of the history of life on Earth by charting the evolution of consciousness. When did our progenitors first become self-aware, and what were the implications for the success of humans as a species? Finally, what are our prospects for spreading the biosphere beyond Earth itself?
35. The Humble Origins of Human Beings
November 21, 2024
Bearing in mind that humans are a transitional species, not the climax of creation, chart our humble origins and the source of our most distinctive feature: a large brain. Study the fossil record to learn which came first: a big brain or bipedal posture.
34. The Rise of Mammals and the Last Ice Age
November 21, 2024
Mammals evolved at the same time as the dinosaurs but did not come into their own until well after their much larger competitors went extinct. Trace the rise of mammals and their domination through a series of glacial cycles, including the present interglacial period.
33. The Collision of North and South America
November 21, 2024
By the extinction of the dinosaurs, the continents were closing in on the configuration they have today-except North and South America had not yet joined. Tour the distinct flora and fauna of South America before its isolation ended with the land bridge to the north.
32. The Sky Is Falling - End of the Dinosaurs
November 21, 2024
Study the most famous mass extinction of all: the disappearance of more than half of all species, including the dinosaurs, at the end of the Cretaceous period, 65.5 million years ago. Follow the clues that suggest an extraterrestrial impact caused a cascade of catastrophes.
31. The Cretaceous Earth - A Tropical Planet
November 21, 2024
Conditions in the mid- to late-Cretaceous were unusually tropical worldwide, with very high sea levels. As a test case in modeling ancient climates, study factors that may explain this remarkable episode in Earth's history. Also explore what it meant for life to exist in a global hothouse.
30. Monsters of the Deep - Mesozoic Oceans
November 21, 2024
Plunge into the oceans of the Mesozoic era, 251-65.5 million years ago, discovering that some creatures look familiar, while others are incredibly alien. The descendants of one monster of the Mesozoic, the plesiosaur, supposedly survive today in Scotland's Loch Ness. Weigh the evidence for and against these reports.
29. Conquering the Air - The Evolution of Flight
November 21, 2024
Take to the air to discover how creatures evolved the ability to fly. Insects made the leap first, aided by their small size. Feathered dinosaurs are thought to be the progenitors of birds. Unravel the avian link to dinosaur species such as Archaeopteryx and Microraptor.
28. Letting the Dinosaurs Speak - Paleobehavior
November 21, 2024
How accurate are portrayals of dinosaurs in today's media? Learn what the fossil record says about how dinosaurs actually looked and lived. Also, probe the theory that dinosaurs were warm- rather than cold-blooded, which has important implications for their behavior.
27. The Dinosaurs Take Over
November 21, 2024
From the reptile populations that struggled through the End-Permian extinction, the dinosaurs ultimately emerged. What conditions promoted their evolution and eventual domination of the biosphere? And what other living things shared the planet with these paleontological celebrities?
26. Finding the Killer - The Greenhouse Earth
November 21, 2024
Track down the smoking gun for the End-Permian extinction. Whatever was behind it plunged Earth into an intense greenhouse effect, turning the land into desert and throwing marine ecosystems into a death spiral. Probe a diverse range of theories before settling on the probable cause.
25. Permian Extinction - Life's Worst Catastrophe
November 21, 2024
Examine the full extent of the cataclysm that swept Earth 251 million years ago. Called the End-Permian extinction, the event left a chilling fossil record. Survey the clues that show land and ocean ecosystems collapsing, wiping out 95% of all plants and animal species.
24. Amniotes - The Shape of Things to Come
November 21, 2024
Search for the origin of amniotes, which are egg-laying tetrapods, such as reptiles. Delve into the history of classification systems for life. The Linnaean system is based on resemblances between organisms. Learn why the more recent cladistic system, based on shared characteristics, implies that there is no such thing as a reptile.
23. Carboniferous Giants and Coal
November 21, 2024
Most of the world's coal deposits were laid down in the Carboniferous period, about 300 million years ago. Tour the global environment that created this unique formation and spawned many evolutionary innovations, including the amniotic egg. Also, discover why insects were much larger then than today.
22. Tiktaalik - The Search for a Fishapod
November 21, 2024
Hunt for the fishapod
21. These Limbs Were Made for Walking?
November 21, 2024
How did vertebrates make the leap from water to land? Follow the quest for evolutionary transitional forms for land-dwelling vertebrates, focusing on the competing theories of gradualism and punctuated equilibrium. The answer to the puzzle may lie in a transitional environment between water and land.
20. The Evolution of Jaws
November 21, 2024
The first vertebrates were easy targets for killer arthropods and other marine predators. What eventually gave them the upper hand? Trace the circuitous evolution of jaws and the rapid development of fish that followed. Also crucial was the internal skeleton, which has some surprising advantages.
19. Getting a Backbone - The Story of Vertebrates
November 21, 2024
Search for the earliest vertebrates, which arose from chordates-animals with a rod-shaped notochord. Also probe the mystery of an extinct chordate called the conodont, which is valuable in oil exploration. Finally, discover why we have calcium phosphate skeletons.
18. Making the Break for Land
November 21, 2024
Consider the adaptations needed to make the transition from the buoyant, nourishing realm of water onto the perilous dry land, with its temperature extremes and relentless pull of gravity. Plants and animals each evolved unique adaptations to make this daring leap.
17. The Collapse of Earth
November 21, 2024
Five mass extinctions have occurred in the last 500 million years. Focus on the first of these, which extinguished the tropical paradise that flourished in the Ordovician period. Did plate tectonics initiate this radical transformation? Or could the cause have been extraterrestrial?
16. Introduction to the Great Mass Extinctions
November 21, 2024
Earth's fossil record is punctuated with episodes when large fractions of all species abruptly disappeared. Examine the distinction between background extinction and mass extinction. Then look for factors that lead to these periodic catastrophes, and search beyond Earth for a possible explanation.
15. The Forgotten Fossils in Earth
November 21, 2024
Survey fossils that are often neglected in popular accounts of the history of life. Begin with corals and the reefs they build, which were teeming with invertebrates hundreds of millions of years ago. Then turn to micropaleontology, which is one of Professor Sutherland's research areas.
14. Window to a Lost World - The Burgess Shale
November 21, 2024
In 1909, paleontologist Charles Walcott chanced on one of the most remarkable fossil finds in history: the Burgess Shale in the Canadian Rockies. Tour some of this quarry's astonishing specimens, which brought the world of the Cambrian explosion to vivid life.
13. Incredible Variety - The Cambrian Explosion
November 21, 2024
The Cambrian period is notable for its immense variety of animals with many different body plans. In an explosion of diversification, shells, teeth, eyes, and other innovations emerged as creatures competed in an evolutionary arms race. Investigate the key factors driving this transformation.
12. Metazoans - Life Grows Up
November 21, 2024
Make the transition to multicellular life, which grew in complexity as oxygen levels increased in the atmosphere, supporting creatures with more intricate metabolisms. This portion of the fossil record long eluded paleontologists, partly because few expected to find signs of life in ancient Precambrian rock.
11. Snowball Earth - Another Crisis
November 21, 2024
Follow the clues that suggest Earth went through a snowball phase around 635 million years ago, nearly ending life's story. How did it happen? How was it reversed? And above all, how did photosynthetic life survive if it was trapped beneath the ice for millions of years?
10. How Life Transformed the Early Earth
November 21, 2024
Trace the perils of life on the early Earth. Having survived a seething period of volcanism and a withering bombardment by asteroids, bacteria-like organisms flourished and began to transform the planet. Learn how their success was almost their undoing.
9. Hints of the First Life Forms
November 21, 2024
Did Martian meteorites seed the young Earth with simple life forms? Investigate this intriguing hypothesis. Then embark on a quest for Earth's oldest fossils, exploring their connection to organisms still found on the planet today, some of them hidden deep within the crust.
8. The Early Chemical Evolution of Life
November 21, 2024
Probe possible scenarios for the origin of life, from the "warm little pond" filled with organic compounds that Charles Darwin envisioned, to deep ocean environments energized by volcanic vents. Sharpen the search by defining the properties that the earliest life must have had.
7. Origins of Land, Ocean, and Air
November 21, 2024
Investigate the origin of Earth's ocean. Then track down the oldest rocks on the planet, which shed light on the first continents. Also explore the nature of Earth's primordial atmosphere and why we are surrounded by a thick blanket of air despite periodic blasts of charged particles from the sun.
6. Earliest Origins-Formation of the Planet
November 21, 2024
Turn back the clock to Earth's earliest epoch, focusing on these questions: How did the solar system form and why do we live on a layered, differentiated planet? What do these events and the formation of the moon have to do with the evolution and development of life on Earth?
5. The Shifting Surface of Planet Earth
November 21, 2024
The history of science is marked by ideas that were before their time. One of the most important was Alfred Wegener's concept of continental drift, which was revived in the theory of plate tectonics. Explore the role that fossils played in this original grand unifying theory of geology.
4. Paleontologists as Detectives
November 21, 2024
Learn how paleontologists interpret fossils to reconstruct the traits and environments of extinct life forms. Examine some of the pitfalls of the field, including cultural biases that can lead to doubtful conclusions, such as that Tyrannosaurus rex was as terrible as depicted in the movies.
3. Fossil Clocks
November 21, 2024
Delve into biostratigraphy, the study of fossil sequences in rock strata. The discovery that different layers of rock are characterized by distinctive fossils solved the problem of correlating sedimentary strata from different regions. This led to the geological time scale, initiating a revolution in Earth science.
2. The Vast Depths of Earth Time
November 21, 2024
How was the great antiquity of Earth discovered? Survey the observations that led to the concept of deep time and, in the process, developed the tools that can read the story in rocks. End with a striking analogy that puts human time into perspective.
1. The Interconnected Earth
November 21, 2024
Begin the story of life on Earth with an overview of the unifying idea that will govern your exploration. Called Earth system science, this approach views Earth as an integrated network comprising the lithosphere, hydrosphere, atmosphere, and biosphere. Sample the complex interactions between these realms.
Description
Could our planet have been seeded with life from elsewhere? How have natural forces conspired to remove most traces of life from the planet? And how has life itself responded with determination to survive and thrive in a multitude of astonishing forms? Learn about the amazing story of our world—its origins, extinctions, and evolutions—in the 36 lectures of A New History of Life.
A New History of Life is a series that ran for 1 seasons (36 episodes) between November 21, 2024 and on The Great Courses
Where to Watch A New History of Life
A New History of Life is available for streaming on the The Great Courses website, both individual episodes and full seasons. You can also watch A New History of Life on demand at Apple TV Channels and Amazon Prime and Amazon.
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Premiere DateNovember 21, 2024
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