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Can you solve the Ragnarok riddle? - Dan Finkel

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Ragnarok: The fabled end of the world, when giants, monsters, and Norse gods battle for the future. The gods were winning until the great serpent Jörmungandr emerged. It swallowed Valhalla and contorted itself across the land. Odin has just enough power to strike with one final bolt of lightning, and you have the fabled hammer, Mjölnir. Can you two destroy the serpent? Dan Finkel shows how.

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TED-Ed Animations feature the words and ideas of educators brought to life by professional animators. Are you an educator or animator interested in creating a TED-Ed Animation? Nominate yourself here »

Meet The Creators

  • Educator Daniel Finkel
  • Director Igor Coric
  • Narrator Addison Anderson
  • Storyboard Artist Igor Coric
  • Animator Igor Coric
  • Compositor Igor Coric
  • Art Director Igor Coric
  • Director of Production Gerta Xhelo
  • Editorial Director Alex Rosenthal
  • Producer Bethany Cutmore-Scott
  • Fact-checker Eden Girma
  • See more
Additional Resources for you to Explore
Ragnarok. The fabled end of the world, when Norse gods and monsters fight for supremacy. As Thor, you must stop a giant serpent from digesting Valhalla by channeling Odin’s lightning along the length of its body. But can you find a path that will completely destroy it?

The video briefly references the case when all the nodes in a graph have an even number of edges. Will the starting and ending point of an Eulerian circuit on such a graph always be the same node? How do you know? Try drawing examples of other graphs with this property, and see whether the starting and ending points of an Eulerian path are indeed always the same.


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About TED-Ed Animations

TED-Ed Animations feature the words and ideas of educators brought to life by professional animators. Are you an educator or animator interested in creating a TED-Ed Animation? Nominate yourself here »

Meet The Creators

  • Educator Daniel Finkel
  • Director Igor Coric
  • Narrator Addison Anderson
  • Storyboard Artist Igor Coric
  • Animator Igor Coric
  • Compositor Igor Coric
  • Art Director Igor Coric
  • Director of Production Gerta Xhelo
  • Editorial Director Alex Rosenthal
  • Producer Bethany Cutmore-Scott
  • Fact-checker Eden Girma
  • See more