Oh for heaven's sake! These types of puzzles work like this all the time. I've been doing logic puzzles since I was a child. They do NOT list all the names, all of the colors, all of the drinks, etc., etc. You are supposed to use reasoning to figure it out, not say "The German in the green house has a pet, but I can't assume it's a fish." I have no reason to think Einstein even knew about this puzzle, let alone made claims that too many people make an assumption about fish!