Answer:
I'm not a bird but I can fly through the sky. I'm not a river but I'm full of water.
I am heavy forward but backward I'm not.
Iron roof, glass walls, I burn and burn but never fall. What am I?
What runs but never walks has a mouth but never talks has a head but never weeps has a bed but never sleeps?
What do you call a bear in the rain?
I flow from the Homerβs mouth when he sees doughnuts.