Answer:
They are two brothers. However much they run, they do not reach each other.
Makes apples fall from trees
Handy when you need to measure something or run a kingdom.
What starts with a T ends with a T and is full of T?
A person who chews the ends of their fingers
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.