I can give you some ideas. One idea would be botany. You could also do it on chemistry, electricity, biology, and many more things. One for botany would be like Does Music Effect Plant Growth? For chemistry, you could use How Do You Seperate Salt and Sugar After They Are Mixed Together? For electricity, you could do How Do Different Materials React to Static Electricity? And finally, for physics, you could do Which Insulation Material is Best?
If you want any more ideas, just post asking if I can give more.
Thanks!
