Answer:
What object has keys that open no locks, space but no room, and you can enter but not go in?
Its days are numbered.
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
Mouth up it gets filled, mouth down it gets empty.
Which weighs more? A pound of iron or a pound of feathers?
Dark, feathery, and popular in Baltimore and fantasy books.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?