- The universe is the same age for all objects within it.
- Chemical reactions between two chemicals takes the same amount of time on Earth as they do on any other potentially habitable planet. (Corollary: physics is the same on all habitable planets)
- Human intelligence on Earth evolved as fast as the underlying chemistry could support it.
Conversely, if their intelligence is far more advanced, then we would have to question what happened during our development to stunt our growth.