Answer:
Die without me, never thank me. Walk right through me, never feel me. What am I?
I sit in a corner while travelling around the world.
I am lighter than air, but a hundred people cannot lift me. Careful, I am fragile. What am I?
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What am I?
I am not very commonly found! Only in some rainforest! I have an odd number of toes! I'm very lazy and hang upside down!
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.