The concept of extra dimensions is a central theme in the two podcast episodes provided, with both discussing the possibility of dimensions beyond the three spatial dimensions we directly experience.

In Episode 31493, Cumrun Vafa discusses a model in string theory that suggests the possibility of one extra dimension opening up at the micron scale, which could help unify dark matter, dark energy, and gravity. The episode explores how this additional dimension could lead to testable predictions about light particles and extra dimensions.

Similarly, Episode 16946 delves into the concept of extra spatial dimensions and their implications for physics, as Janna Levin and the hosts discuss mind-bending concepts in quantum mechanics and the nature of spacetime.