Science project (demonstration needed)

​i need list of 50 basic science project (just list) for my student, its 6th grade Kids so project must be simple, easy yet exciting, time to complete the project that i am gonna give them is 15 days only so project must be complete able with 10-15 working hours with or without parents help.

every project must be mentioned as if they are guardian free or if any guardian supervision is required.

example of these projects are “Carbon cycle”, “litmus paper and lemon”