Why is this being bumped?
Why was this even a thread?
Ask questions with answers that you want to know about, that you can't find online or that isn't easily available.
Asking 50 question will not impress your interviewer, if anything hurt you because it shows you didn't even do your homework and that you might not be serious/committed.
Simply put; if you have a question about their school/DS in general that you can't find online, ask!