What are some of the good science fair subjects?

I want an experiment concerning physical science, mathematics, computer science, and energy, all mixed up together; I want an experiment that includes all these subjects

If you are not working in any Research organizations, getting an idea and the collecting a huge funds will be the constraints for the project.

Every field of science has a lot of research work to be done. The growth of pure science has been hampered because of the IT field's high returns.

Wireless transmission of electricity

Try to develop a method for electricity transmission without media in the wire free world. It can reduce the huge power loss faced when it is transmited from Power plant to customers.