An island is inhabited by two tribes of vicious cannibals and, sadly, you are a prisoner of one of them. One tribe always tell the truth, the other tribe always lie. Unfortunately both tribes look identical. They will answer ‘yes’ or ‘no’ to a single question they will allow you. The God of one tribe is female, the God of the other tribe is male, and if you correctly state the sex of their God they will set you free. Use truth tables to help you formulate a question that will enable you to survive.