- What If Planet Nine Exists?
- What If You Were Bitten by One Million Ticks?
- What If There Were No Wind?
- What If You Had a Cosmic Twin?
- What If There Were an Underground City Below Denver Airport?
- What If You Could Walk Through Walls?
- What If It Takes Two Years for a COVID-19 Vaccine?
- What If You Were Infected by the Cordyceps Fungus?
- What If We Could Build a Matrioshka Brain?
- What If the Big Rip Happened Tomorrow?
- What If We Could Hear the Sun?