What makes our dimension or universe unique from all others?

 Our dimension, or universe, is unique in many ways, but one of the most fundamental differences is that it is the only universe that we know of that contains life. As far as we know, our universe is the only one that contains the conditions necessary for the formation of galaxies, stars, planets, and life as we know it.

Additionally, our universe is unique in its physical properties and the fundamental laws that govern it. For example, the physical constants, such as the speed of light and the gravitational constant, are thought to be fine-tuned to allow for the formation of complex structures like galaxies, stars, and planets. Similarly, the fundamental laws of physics, such as the laws of motion and thermodynamics, are thought to be necessary for the evolution of life.

Overall, while it is possible that there may be other universes out there, the one that we inhabit is unique in many ways, including the fact that it is the only known universe that contains life and the fundamental laws and physical constants that make that life possible.