Answer:
I occur twice in eternity. And I'm always within sight.
The part of the bird, that is not in the sky, Which can swim in the ocean and always stay dry. What is it?
I am the yellow hem of the sea's blue skirt.
What can you keep after giving it to someone?
What travels around the world without leaving the corner?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?