Speaking of caution with powerful magnets, they can do some real damage!
This link is not for the squeamish - be warned.  When magnets attract 
each other
from 20" apart and coming flying together, the results aren't pretty.

http://magnetnerd.com/Neodymium%20Magnets/Dirks%20Accident.htm

Martin McCormick wrote:
> 	As I said, they are really stout magnets so they must be
> handled with some caution as they would probably be very
> difficult to get out of any holes they might fall in to. They
> would also do a real number on any mag stripe cards or floppy
> disks they encountered.
>
> Martin McCormick WB5AGZ  Stillwater, OK 
> Systems Engineer
> OSU Information Technology Department Telecommunications Services Group
>   

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