Answer:
What you do to determine the length of something
Which one of Santa's reindeer can be seen on Valentines day?
Kids play it and Michelangelo sculpted with it.
What can you hold in your left hand but not in your right hand?
If you are unsure how to use one then just ask a flight attendant.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?