Answer:
Feed me and I live, give me drink and I die.
What building has the most stories?
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
If I have it, I don't share it. If I share it, I don't have it. What is it?
What is lighter than what it is made of?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?