Rather than a racial matter, it's more of a lack of resources to develop into organized civilization. Places like Africa, Australian outback, and the like, are usually either comprised mostly of difficult-to-clear rainforest or parched-dry desert with few sources of water. More focus is placed...
Ask one of them "If I were to ask the OTHER man which door would lead to endless pain and suffering, which door would HE point to?"
After that, take the door that man points to. Why?
If I were talking to the man that cannot lie (i.e. always tells the truth), he'll say that the other man (the...
If you are referring to riddles such as "A man is found lying dead in an open field with nothing but an unopened package beside him. How did he die?", then what you're looking for is called a "Lateral Thinking Puzzle."