Neeum Zawan wrote:
> stay apart even though there is no actual force interaction between them

http://en.wikipedia.org/wiki/Pauli_exclusion_principle

"""
The consequence of the Pauli principle here is that electrons of the same 
spin are kept apart by a repulsive exchange interaction, which is a 
short-range effect complemented by the long-range electrostatic or coulombic 
force. This effect is therefore partly responsible for the everyday 
observation in the macroscopic world that two solid objects cannot be in the 
same place in the same time.
"""

Sounds like it's both, holding your butt up. :-)

-- 
Darren New, San Diego CA, USA (PST)
   Serving Suggestion:
     "Don't serve this any more. It's awful."

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