>> because,
>> zero plus zero --- always equals zero
>>
>> weather you or anyone 'accepts' it or not
>
>Prove it!
>
Space isn't necessarily ZERO either.  Get enough sub-atomic particles
randomly bumping together and you may end up with a proton (or electron or
neutron).  In the dark ages they thought maggots spontaneously appeared on
meat.  We now know better.

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