Answer:
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
What can be heard and caught but never seen?
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
A precious stone, as clear as diamond. Seek it out while the sun's near the horizon. Though you can walk on water with its power, try to keep it, and it'll vanish in an hour.
A harvest sown and reaped on the same day In an unplowed field, Which increases without growing, Remains whole though it is eaten Within and without, Is useless and yet The staple of nations.
It's what light turns into in the night
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?