- Discussed: What If Jupiter Never Existed? - with Steve Levin | Episode 15
- What If the U.S. President Dies Before the Election?
- What If You Were Shot Out of a Liquid Nitrogen Cannon?
- What If We Powered the Planet With Seawater?
- What If We Built a Road Around the World?
- What If We've Already Made First Contact With Aliens?
- Discussed: What If We've Already Made First Contact with Aliens? - with Andrew Siemion
- What If We Became Cyborgs?
- What If Russia Won the Space Race?
- What If There is Life on Venus?
- Discussed: What If There Is Life on Venus? - with Sara Seager
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