Answer:
Sends paper without using the post office.
They are two brothers. However much they run, they do not reach each other.
What has thousands of ribs and two backbones?
When this is found in a road you are forced to make a decision.
What is broken if you say its name?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.