People tend to check in during these times:
You can get good fresh Pizza at the canteen in the "Verwaltungsgebäude" :-)
Cafeteria next to Mosaic Hall is open till 5pm and serves nixe snacks.
Visit "Eichensaal" (oak hall), the room for decision in the eastern wing
hehe...i agree to the tipp about the canteen...avoid it!
Avoid the canteen... especially on Fridays