I am not very certain of what you’re asking, but I’ll answer it according to my interpretation. I think that you mean, you need something that will attract money from the students, yet the thing you create must useful to your fellow peers? Well, you could create (since it has to do with science) a little booklet about science, something like a study handbook for what you’re learning at school. Or, perhaps you can create a contest that the contestants must pay to enter, like a little quiz show or something, like jeopardy, and the prize is something that you have invented, or something that the students may want. Sorry if this answer wasn’t what you wanted. I hope I helped…