- What If No One Ever Died?
- What If You Didn't Wash Your Hair for a Year?
- What If Tardigrades Were the Size of Humans?
- Discussed: What If You Explored the Deepest Points of Earth? - George Kourounis
- What If We Settled on an Exoplanet?
- What If a Magnitude 20 Earthquake Hits?
- What If You Ate Nothing But Sugar for a Month?
- Discussed: What If You Ate Sugar for a Month? - with Gary Taubes
- What If a Supernova Exploded Close to Earth?
- What If There Were Only 1,000 People Left on Earth?
- What If You Explored the Deepest Points on Earth?