Answer:
It cannot be seen, it weighs nothing, but when put into a barrel, it makes it lighter.
They have not flesh, nor feathers, nor scales, nor bone. Yet they have fingers and thumbs of their own. What are they?
What is it that you must give before you can keep it.
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
What goes in the water red, and comes out black?
Be sure to shout for its answers are weak, but there is no language it cannot speak.