Answer:
What can burn the eyes, sting the mouth, yet be consumed?
What is that which, though black itself, enlightens the world without burning?
There is a puzzle which can be asked all day with a different correct answer each time. What is the puzzle?
As I walked along the path I saw something with four fingers and one thumb, but it was not flesh, fish, bone or fowl.
What goes through a door but never goes in. And never comes out?
The warmer I am the fresher I am.