Sometimes finding a topic can be easy: you may have heard a story on the news, read an article in a newspaper or science blog. If you haven't already seen something that interests you, you can turn to popular science sites for inspiration. If you find a useful article, you can follow up on their sources. Here are some places you can start:
You may have to do a lot of searching for this assignment. A Research Log can be a great way to track it. It will help you keep track of where you searched, what terms you used, and how they worked. You can use the example below or make up your own.