On 11 Sep 98, at 16:44, Pete Weiss wrote:
>
>The analogy that I like to use is how do you undo the throwing of a
>ping-pong ball into a room of armed mouse-traps each of which has a
>ping-pong ball attached?
>
>/Pete

This is a much cooler analogy to visualise if you're old enough to remember
that Disney (?) educational film on what nuclear fission looked like.  ;-)