For example, that they were able to draw, very accurately depict animals, that they were very observant and tried to learn as much as possible about the world. But still, there were more questions than answers. So they had a religion. They considered themselves a part of nature, believed that everything around them was inhabited by spirits who had to be appeased in order to enlist their support.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.