Answer:
Until I am measured I am not known, Yet how you miss me when I have flown.
Who spends the day at the window, goes to the table for meals. And hides at night?
What instrument can make any sound and be heart, but not touched or seen?
What surrounds the world, yet dwells within a thimble?
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
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?