1: Eons How Two Microbes Changed History

2: Eons The Time Terror Birds Invaded

3: Eons Untangling the Devil's Corkscrew

4: Eons The Great Snake Debate

5: Eons The Whole Saga of the Supercontinents

6: Eons From the Cambrian Explosion to the Great Dying

7: Eons How Sex Became a Thing

8: Eons The Other Explosion You Should Know About

9: Eons How the Turtle Got Its Shell

10: Eons What a Dinosaur Looks Like Under a Microscope

11: Eons The Most Useful Fossils in the World

12: Eons Inside the Dinosaur Library

13: Eons What Was the Ancestor of Everything?

14: Eons How the Squid Lost Its Shell

15: Eons How the Chalicothere Split In Two

16: Eons The Age of Reptiles in Three Acts

17: Eons The Weird, Watery Tale of Spinosaurus

18: Eons From the Fall of Dinos to the Rise of Humans

19: Eons That Time It Rained for Two Million Years

20: Eons Why Triassic Animals Were Just the Weirdest

21: Eons Where Did Viruses Come From?

22: Eons When Fish First Breathed Air

23: Eons How the T-Rex Lost Its Arms

24: Eons FAQs From Our First Year

25: Eons When Insects First Flew

26: Eons The Mystery of the Eocene’s Lethal Lake

27: Eons When Fish Wore Armor

28: Eons When Birds Had Teeth

29: Eons How Horses Took Over North America (Twice)

30: Eons How a Supervolcano Made the Cenozoic’s Coolest Fossils

31: Eons The Rise and Fall of the Bone-Crushing Dogs

32: Eons Life, Sex & Death Among the Dire Wolves

33: Eons When We First Walked

34: Eons Did Raptorex Really Exist?

35: Eons Can We Get DNA From Fossils?

36: Eons When Giant Amphibians Reigned

37: Eons Your Place in the Primate Family Tree

38: Eons The Two People We're All Related To

39: Eons When Rodents Rafted Across the Ocean

40: Eons When Birds Stopped Flying

41: Eons When Camels Roamed North America

42: Eons How Sloths Went From the Seas to the Trees

43: Eons When Sharks Swam the Great Plains

44: Eons When Apes Conquered Europe

45: Eons Why Megalodon (Definitely) Went Extinct