Answer:
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
What is it that has four legs, one head, and a foot?
What do you have when you're sitting down that you don't have when you're standing up?
Has feathers but can't fly. Rests on legs but can't walk.
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
I'm the source of all emotion but I'm caged in a white prison.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?