How does this Crystal Ball thingy work?

[Batsinma Belfry]

Crystal Ball

[Cajun Man]

Since this has a factual answer, I'll move it to GQ for you.

__________________

Cajun Man ~ SDMB Moderator

[Captain Gutgore Blooddrink]

Once you add the sum of any two didgit number, and the subtract that sum from the original, it's always a multiple of nine.

The only possible numbers are:

81
72
63
54
45
36
27
18
9

And those are always the same symbols

[Loopus]

Your link is taking forever to load for me, but it sounds like the same thing Snopes describes here.

[DarrenS]

Others too have wondered this:

http://boards.straightdope.com/sdmb/...hreadid=163712
http://boards.straightdope.com/sdmb/...hreadid=169075
http://boards.straightdope.com/sdmb/...hreadid=166356