Need Science Fair Ideas!

I am required to participate in a state wide science fair. However, I can't think of anything I could do it on.

The ideas have to be at a 9-12th grade level. And it can be on ANYTHING as long as it is TESTABLE.

Anyone got any ideas?

How about a demonstration with light? Ie. Prisims, mirrors, materials of different refractive indecies. You could demonstrate refraction, reflection, and diffraction! As well as create some cool images.

You could build a "light spedometer" because when light passes through different mediums it slows down. Have a vacumn tube with the default 3.0x10^8 m/s then go from there.

That would be fun

Another idea is to get a nice telescope and measure the radiation emitted from a star of your choice. From this you can tell what the star is made of, what gases surround it, and the temperature. This one would be slightly more involved as you'd need to aquire a telescope that can see more than your eye

here is this one that uses simple circute to create kinda a light switch. if you press on the ruler, the light will start to go on.

I cna get u the instructions if you want?

Except blowing judges up = not cool.

I'd suggest something to do with reactions, and how fast things take to react to something

Rofl, I feel so badly. All the science experiments I ever did on my own were constructing models of the planets in the solar system and making volcanoes.

Well you could try magnets, heres a good idea try to make a magnet that is small, but powerful enough to lift a few cans of food of the ground, I worked on this project during my freshman year its kinda hard to make...you could also try to make robotized magnet..but you would have to shell out tons of money just for that.