-> Hello Wayne,
-> 
-> WC>I suggest a duel between us.
-> WC>I get to pick the location, distance and weapons.
-> 
-> WC>I chose Brunswick 16 pound bowling balls at 400 paces.
-> 
-> WC>My location: The 40th floor of the Sears Tower in Chicago.
-> WC>Your location, directly beneath me on the ground floor.
-> 
-> WC>You may fire first!
-> 
-> That reminds me about a science fiction short story I read
-> a while back.  It was a duel between two astronauts, on an
-> asteroid.  Naturally, the setting was on the surface of the
-> asteroid.  And naturally, each astronaut was throwing rocks
-> found on the asteroid's surface at each other.  I'll let
-> you figure out what happens when astronauts throw rocks at
-> each other while on the surface of an asteroid that has no
-> atmosphere...

Nor gravity so equal and opposite force reaction applies.
Thrusting backwards.

Man who shooting gun in space is a man going places.
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