Answer:
When you need me, you must find me. When you find me, you no longer need me. What am I?
Lighter than feather and softer than silk, yet the strongest man in the world cannot hold me for more than a few minutes. What am I?
What time of day, when written in a capital letters, is the same forwards, backwards, and upside down?
I am a chair that can move. What am I?
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.