Answer:
What can you put in a barrel to make it lighter?
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.
Where humans breath liquid?
He has married many women but has never married.
What has a head, a tail, is brown, and has no legs?
What never gets any wetter no matter how hard it rains?