Answer:
What goes through a door but never goes in and never comes out?
There's one in every deck of cards and in a famous movie
The part of the bird, that is not in the sky, Which can swim in the ocean and always stay dry. What is it?
It covers you, you lose it every day and you'd die without it.
When a doctor hits you with a hammer he is testing this
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?