What am I

I am nothing yet everything,
I have no teeth yet I can nip,
I have no voice yet I cry,
No wings are on me yet I flutter,
No mouth yet I mutter,
I can be everywhere yet right in front of you,
I can help you out or destroy your day,
I am as a feather yet can rip through buildings
I'm am the softest note on the music sheet yet the angriest monster you'll see.  What am I?
 

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