i need a science fair project! Please help!?

Question

i want to do something with humans, but it cant involve anything with their interior.

Answer 1

You should try and google search, science fair project. I found one website that may help you, it has some Biology, Human Anatomy and Human Psychology ideas. Good luck with your project!
Here is the site
http://www.all-science-fair-projects.com/category0.html

Answer 2

You'll have to get permission from your parents to do this.

Get two mice - or two rats - or two gerbils - or even two hamsters. Feed one healthy food and feed one junk food. Note what happens.

Mice are probably the best speicmens.