6 Brilliant Doubts.!

1. If all the nations in the world are in debt, where did all the money go ? 
2. When new cat food with improved taste, who tests it ? 
3. If the "black box" flight recorder is never damaged during a plane crash, why isn't the whole airplane made out of that stuff ?
4. Who copyrighted the copyright symbol ? 
5. Can you cry under water ? 
6. Why do people say "you've been working like a dog" when dogs just sit around all day ??