Answer:
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
Though I have neither legs nor feet, my use is for to go; Although I cannot speak, I tell what others want to know
Lighter than what I am made of, More of me is hidden Than is seen.
Feed me and I live, give me drink and I die.
What comes once in a minute, twice in a moment, but never in a thousand years?
What covers its face with its hands, speaks no language, yet most known what it's saying?