Answer:
the only amusing part of the body
Forward I am heavy backward I am not. What am I?
What can travel around the world while staying in a corner?
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
I am three simple words everyone wants to hear. Three simple words such simple words and yet...life changing...
Give it food and it will live, give it water and it will die.