• Reading Levels 1 - 5
Theory of knowledge | Maths | Science

Why are riddles so difficult to solve?

You have time travelled into the past with your professor — when even older versions of you both appear. They have done exactly the same thing, from even further into the future. Now you are both in the same time, the universe is in danger of collapsing. This video from TED-Ed introduces a riddle to solve the situation.

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