You come to a fork in a road. One road leads you to heaven the other road leads to nowhere. The land is occupied my two tribes, truth tellers and liars. There are no physical characteristics distinguishing members of the tribes. There will be a member of one of the two tribes at the fork. You do not know if is a liar or truth teller. You can only ask one question to answer which road to take that wil lead to heaven. What is that question?