One of the best sources of information about the state of Arkansas, its history and people is the Encyclopedia of Arkansas. Curious about the history of Petit Jean State Park? Interested in the singer Lucinda Williams's connections to Arkansas? The Encyclopedia has information on these and many, many more topics. Here is a brief description of the website and its goals, taken from the About page:
The Encyclopedia of Arkansas History & Culture Project strives to offer a definitive, comprehensive, and accurate record of the twenty-fifth state. The online version of the Encyclopedia is the first component of the Project. The online version of the Encyclopedia will be maintained and updated in perpetuity by the staff of the Butler Center for Arkansas Studies.
It is a great place to start for students who need to do reports, or others just seeking facts. Each article has links to other, related articles, as well as a bibliography at the end. There are many pictures, maps and other resources available as well. Take some time to poke around and see what you can find. I promise it will be worth the time!