Science investigatory projects suck, or at least seem to at first. But you shouldn't let school drag you down. Instead, use your homework assignment as an opportunity to solve a problem you've always been interested in. And it doesn't hurt if the end result is eco-friendly, either.
Take a gander at this video from YouTube user ohmydolly to learn how to mix a natural and eco-friendly insect repellent that's made with affordable materials. Not only will you be getting rid of pesky bugs from your house, but you will also be helping out the environment with these toxin-free ingredients.
Note: feel free to use this as your own science project, with or without changes.