Just in time for Halloween, and it’s down right scary.
Your computer is going to read your mind!
http://www.learnenglish.org.uk/games/magic-gopher-central.swf
Well, the computer, of course, is not reading anyone’s mind.
There’s a neat trick in math where subtracting the sum of the digits of a two-digit number from itself always equals a multiple of 9.
So, for example if you have [...]
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