The history of comedic film represents a very easy research paper topic despite being a very broad subject. Thousands of books and documentaries are readily available to help with your research. That does not include the vast number of websites dedicated to funny movies. You can also easily break this large topic down into more manageable size by focusing on specific genres, such as screwball comedy, satire, slapstick and romantic comedy.
Researching Shakespeare's history plays provides the opportunity to craft a paper focusing on either the history or the drama. Either route means you have access to resource material in just about any library in the country. It may be difficult to determine which subject you are likely to find more useful research material on: Shakespeare himself or the subjects of his historical plays.
You may not even have to conduct much formal research to write a paper on how colors become associated with certain moods and emotions. Entire books have been written on the subject of how color affects people, and various websites on the subject exist. You could even write a research paper on how different cultures use the same colors for different effects in their traditions. Be sure to look to books on interior decoration to guide you to information such as how the color orange is used to lessen aggressiveness and how blue promotes serenity.
Exercise books have grown from cottage industry to full-scale industry in the publishing world. Write a research paper on the best way to get into shape, develop rock-hard abdominal muscles or cut down on junk food. There's no shortage of information offered by fitness experts, as well as celebrity endorsers on the best way to get into swimsuit-type shape.
Write a research paper on how an appliance you use every day works. The possibilities are virtually endless, as you can describe how air conditioning, a furnace, television or a cell phone works. Many books have been written about how things work, and entire websites are devoted to explaining the intricacies in accessible language.