Comments are closed?

For some reason, comments have been disabled for my blog.  Does anyone know why this has happened?

I realize I haven’t been making many posts here, but that shouldn’t have any bearing on what gets commented on.
Let’s see what happens to this post…
EDIT:  I found the culprit!!  Buried down in my settings is a check box that says “Turn off comments after [fill in the blank] days.  It was set to “14”.  I changed it to “90”.  I’d never noticed this check box before.