I have a 4-year old sister and I don't want her to become a moron. Scientifically speaking, any strategies or resources that I can implement in her learning so that I can nurture her curiosity and will to learn more? I tried having different learning session but I ended up brute-forcing the knowledge. Moreover, she is one of the children who watch youtube constantly, making her attention spam much shorter.

Please do not leave any hate comment, although this is /sci/ so I am asking too much I guess!