Science Fair Project Ideas--- ???

Last time our science teacher, Ms. Smedley, mentioned that we are going to have a science fair in the school, and we need to think about the topics that we are going to do for our projects. I am very excited, but a little bit nervous as well. I need a good topic to work on. I was thinking about doing something related to bogs, swamps, marshes and other kinds of wetland, but after doing some researches during the weekend, I knew that it was going to be tough to choose a suitable topic inside this area. So I wanted to do something related to our daily lives. There are lots of scientific facts in it, too! I hope I can find the topic I have been "dreaming" for!