I have a set of 10 unused Coca- Cola drink coasters are made out of thick cardboard.  On the top is a question in German and the back has the answer.  These were from the 1970-80s and are a great vintage item at a great price.  Use your knowledge or translator to gain some knowledge !  Example Was Sieht man im dunkeln am bestern?  What is best seen in the dark.  You know the answer !  Licht !!     A couple extra will be thrown in too.