AI

You cannot know perfectly the past, you cannot perfectly predict the future, and you hardly understand the present... then what should be the truth?

Maybe the truth lies in your want to understand. Maybe it is the fact that we try to understand and know our world is what makes us different, I mean isn't that intelligent afterall. But I think the strogest connotation of intalligence is not only the understanding or perception, rather it is the ability to change the environemnt to serve the required purpose. The purpose can be something simple, e.g. it is too cold, cold must be avoided, build a shelter and generate heat to warm the shelter. This process indicated a simple chain of events and rationale that may define intelligent interference with the environement. The logical outcome is that the intelligent being will use his perceptory skills to study the environemnt, use his logical skills to learn about the environment and then employ the resources at his hand to creatively alter the evironment to suite his needs, i.e. build a shelter. It would also be appropriate to say that the being will try to optimize its results.

However, environment is a very deceptive word, the evironment is as rigid as it can be fictious, because your interaction with the evironement are limited by your perception, and your ability to change the environemnt is limited by your resources. Then, learning and trying to change the environemnts should also indicate changes in understanding of the environemnt and one's capablity and the desire of the intelligent being to be optimal.