Cover Letter and UPenn Short Essays

Hey guys,
I was wondering if Upenn requires a cover letter? My dad told me it did but I cannot find the requirement anywhere within the application. Also, does anyone have any suggestions for the short essay questions?

The questions are:
What do you consider the most important moment in history and why?
Tell us something that is not readily apparent from your application.

I have no idea what to put for either. Everything that is unique to me I have already written in my essays. Can anyone help me with this brain block? Thanks; I really appreciate it.