Answer:
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
I can be quick and then I'm deadly, I am a rock, shell and bone medley. If I was made into a man, I'd make people dream, I gather in my millions By ocean, sea and stream.
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
Until I am measured I am not known, Yet how you miss me when I have flown.
Why did Superman flush the toilet?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?