Answer:
What two things can always see what the other sees, but can never see each other?
Take off my skin, I won't cry, but you will.
What starts with a 'T', ends with a 'T', and has T in it?
Only two backbones and thousands of ribs.
In buckles or lace, they help set the pace. The farther you go, the thinner they grow.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?