The Liars and The Truthful I:
Imagine you are on your way to village with people who can only tell the truth. You reach a crossing with a road leading to another village withpeople who always lie. (Also, these people are cannibals, so you don't want to go to their village). You don't know which road leads to which destination. At the crossing you can see a man at coming from one of these villages.
How can you determine which way to go by asking the man only one question ?