Answer:
What has 4 fingers and a thumb, but is not living?
I shave several times a day, yet I still have a beard. Who am I?
What can be white and yellow at the same time?
It is in every mountain, it's not in any hill, it's not in all the world, and yet it's in the mill.
What is so delicate that even mentioning it breaks it?
What did the piece of wood say when he saw the screwdriver and screws approaching?