Answer:
It's in your hand though you cannot feel it. Only you and time can reveal it.
What is it that given one, you'll have either two or none?
What can be white and yellow at the same time?
They keep secrets locked away. And you pass through them each day. For each one there is a key, They respond to sesame.
What instrument can make any sound and be heard but not touched or seen?
What did the piece of wood say when he saw the screwdriver and screws approaching?