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If time travel is possible, why haven't we met a single time traveler yet? And if we did meet one, how would we know they weren't faking it? What would their time machine look like? And how would it operate? Would there be a set of rules for time travelers to follow? And what would happen if they decided to break them?

Transcript and sources: https://insh.world/science/what-if-yo...
Music: http://bit.ly/whatif-music

Watch more what-if scenarios:
Planet Earth:    • What If Earth Was in Fact Flat?  
The Cosmos:    • Video  
Technology:    • What If the Sahara Desert Was Covered...  
Your Body:    • What If You Were Born on a Space Stat...  
Humanity:    • What If You Were the Last Person on E...  

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"Imagination will often carry us to worlds that never were. But without it, we go nowhere." — Carl Sagan

What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure — grounded in scientific theory — through time, space and chance, as we ask what if some of the most fundamental aspects of our existence were different.
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