Answer:
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
I'm sometimes white and always wrong. I can break a heart and hurt the strong. I can build love or tear it down. I can make a smile or bring a frown.
My teeth are sharp, my back is straight, to cut things up it is my fate.
What is it that given one, you’ll have either two or none?
Though I have neither legs nor feet, my use is for to go; Although I cannot speak, I tell what others want to know
What did the piece of wood say when he saw the screwdriver and screws approaching?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?