Answer:
Until I am measured I am not known, Yet how you miss me when I have flown.
I walked and walked and at last I got it. I didn't want it. So I stopped and looked for it. When I found it, I threw it away.
What bird can lift the heaviest weight?
I am the yellow hem of the sea's blue skirt.
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
What never gets any wetter no matter how hard it rains?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?