how smart are you?

Riddle #1 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?

Riddles #2 I never was, am always to be,
No one ever saw me, or ever will,
And yet I am the confidence of all
To live and breathe on this terrestrial ball.
What am I?

Riddle #3 If you break me, I do not stop working,
If you touch me, I may be snared,
If you lose me, nothing will matter.
What am I?