May I do projects in more than one area of study?

If you mean “can you submit the same project to more than one area of study for honors in both,” then the answer is: no. However, if you mean “can you do different projects in two different areas of study,” then the answer is: yes, but with some caveats. The first caveat is that honors projects take a lot of time and energy. You would be well advised to think carefully about trying to take on too much, particularly during your senior year. The risk in trying to do two is that in the process you will most likely not complete either in a fashion that is worthy of honors. The second caveat is that if the projects are somewhat related you will need the approval of both areas of study for your plan. Both areas of study will need to agree that the work done is sufficient to be worthy of honors in their area of study and be comfortable with any overlap. Ideally the director of each project should be included in the process to monitor the degree of overlap, so that you do not suddenly discover that you have a problem at the end.