1: Eons That Time the Mediterranean Sea Disappeared

2: Eons The Neanderthals That Taught Us About Humanity

3: Eons The Giant Dinosaur That Was Missing a Body

4: Eons How South America Made the Marsupials

5: Eons A Short Tale About Diplodocus' Long Neck

6: Eons When the Rainforests Collapsed

7: Eons How a Hot Planet Created the World's Biggest Snake

8: Eons When the Sahara Was Green

9: Eons When Penguins Went From The Sky To The Sea

10: Eons How the Egg Came First

11: Eons How Dogs (Eventually) Became Our Best Friends

12: Eons When a Billion Years Disappeared

13: Eons The Risky Paleo Diets of Our Ancestors

14: Eons How the Andes Mountains Might Have Killed a Bunch of Whales

15: Eons How Plants Caused the First Mass Extinction

16: Eons The Two Viruses That We’ve Had For Millions of Years

17: Eons How We Identified One of Earth’s Earliest Animals

18: Eons When Dinosaur Look-Alikes Ruled the Earth

19: Eons The World Before Plate Tectonics

20: Eons When Dinosaurs Chilled in the Arctic

21: Eons How the Walrus Got Its Tusks

22: Eons The Story of the Dino Stampede

23: Eons The Biggest Frog that Ever Lived

24: Eons The Dinosaur Who Was Buried at Sea

25: Eons How We Figured Out Fermentation

26: Eons The Oddest Couple in the Fossil Record

27: Eons How Ancient Art Captured Australian Megafauna

28: Eons The Sea Monster from the Andes

29: Eons When Rodents Had Horns

30: Eons The First and Last North American Primates

31: Eons How Plants Became Carnivores

32: Eons How Ankylosaurs Got Their Clubs

33: Eons Why Do Things Keep Evolving Into Crabs?

34: Eons How Plankton Created A Bizarre Giant of the Seas

35: Eons The Rise and Fall of the Tallest Mammal to Walk the Earth

36: Eons How Humans Lost Their Fur

37: Eons When Lizards Took Over the World

38: Eons When the Earth Suddenly Stopped Warming

39: Eons The Triassic Reptile With "Two Faces"