1. Even though our eyes are closed we can see during our dreams.
2. Why nose has two nostrils.
3. Gravity.
4. Waves in sea.
5. Birth of Human. Life.
6. Death of Human.
7. Rotation of Earth.
8. Sunlight.
9. Human cannot add anything or reduce anything from this Universe. Human can only convert them into other thing.
10. How consciousness arises from the brain.
11. How the universe came into existence.
12. What are dark matters in space.