Working on a project for school, I am looking for ideas on what to add

This game is basically a laboratory in which players can simulate different science topics to help them understand them better.

Right now I have three implemented topics:
-Gravity
-Magnetism
-Flame colors (To explain why different elements have different flame colors)

However, I need to implement a few more (2-3), I have been thinking on a system to explain diseases, but, I am not sure how I would make it (Not the scripting part, I am not sure how I should implement it so that it is clearly explained).

Any suggestions on topics I could add are welcome and appreciated.