- Discussed: What If an Octopus Was Your Teacher? - with Pippa Ehrlich | Episode 16
- What If Europa Were Earth's Moon?
- What If We Built the World's Deepest Bunker?
- 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?