Answer:
found at the back of the book.
Tuesday, Sam and Peter went to a restaurant. After eating lunch, they paid the bill. Sam and Peter did not pay. Who did?
I have a little house in which I live all alone. My house has no doors or windows and if I want to go out I must break through the wall.
I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each.
It's in your hand though you can not feel it. Only you and time can reveal it.
I saw the dead bring forth the living. I saw the living bring forth the dead. What did I see?