What if every choice you ever made—and didn't make—created a new reality? A universe where you missed that train, took that job, or never existed at all. This isn't just science fiction; it's a possibility that emerges from our deepest theories of the cosmos.

In this episode of The Fundamental Why, hosts Saahil and Cary are joined by a special surprise guest, John Wang, to journey through the mind-bending concept of the multiverse. We break down physicist Max Tegmark's four distinct levels of parallel universes, from the statistically inevitable (doppelgängers living in a universe just like ours) to the truly bizarre (realities where the laws of physics are completely different).

Join us as we explore: 🌌 Level I: The Quilted Multiverse - Are there infinite copies of you out there? 💥 Level II: Bubble Universes - Did our Big Bang create just one universe in a cosmic foam? 🔬 Level III: The Quantum Many-Worlds - Does every decision split reality? 🔢 Level IV: The Mathematical Universe - Is our reality just one possible equation?

But we don't stop at the physics. We dive headfirst into the profound philosophical questions: If infinite versions of you exist, what does that mean for your identity? Does free will still matter? And does the multiverse violate the principle of Occam's Razor?

Let us know your answer to our final question in the comments: Would you want to know about the lives of your parallel selves?