Ideas for a Science project?

I'm doing this Science-type of competition and I only have about 12 ideas. (All from the Internet, so I hope it's not too common!) I want to know if you guys have any ideas, some projects that you may know of, but not a project that thousands of people have done before. Something unique. A project that's a problem or a question that I have to solve. Here are some ideas I already have:

What type of insulation holds in heat the best?
Which cooking method results in the least loss of vitamin C?
Does changing the temperature affect how long a pen will last?
Do all types of bread mold at the same rate?
Do different types of knots affect the breaking strength of a rope?
Does the color of a crayon affect how long of a line it will write?
Does coloring carbonated water change how its taste is perceived?

I still have a few more, but I need some ideas from the people, LOL. Thanks guys!