FIVE RIDDLES

1. What takes a bow before it speaks?
2. What is rarely touched, but often held?
3. What is always in front of us, but never seen?
4. Turn me on my side and I am everything. Cut me in half and I am nothing. What am I?
5. A and B are standing on a hill, and one is the father of the other's son. How are A and B related?

Answers:

1. A violin
2. The future 
3. Your tongue
4. The number 8 (infinity symbol and zero)
5. Husband and wife.