#2554 - Carlo Rovelli

Carlo Rovelli, the Italian theoretical physicist, told Joe Rogan that his own name turned out to be wrong. His father grew up believing his first name was Franco until he requested his birth certificate and discovered it was actually Julio—his mother had wanted Franco, but his grandfather registered him differently. "So he didn't know his own name," Rovelli said. "Even about your own name, you can be wrong." This small story captures the central argument of their conversation: certainty is the enemy of understanding, and the universe is far stranger, richer, and more relational than our everyday experience suggests.

The collapse of objective reality

Rovelli's core claim is that physics itself has been moving away from the idea of an objective, observer-independent reality. For centuries, science seemed to promise a fixed world "down there" made of little things with definite properties, existing whether or not anyone looked. But quantum mechanics, he argues, has undermined that picture. The famous double-slit experiment is the clearest example: send a particle toward a wall with two slits, and if you check which slit it goes through, it goes through only one. But if you don't check, it behaves as if it went through both—interfering with itself in ways that make no sense if the particle always had a definite position. "The question where is the particle if you're not checki