mentatzps: My screen name is quite easy to explain, though no one could guess it...
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First we have to cut "mentatzps" in two : Mentat and ZPS.
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"Mentat" comes from Frank Herbert's saga "Dune". A mentat is a human computer, basically, and I loved that idea of being that, super-clever and brain-enhanced.... I don't think I'm a mentat, but my IQ is 116. (not bad, I think...

)
*
"ZPS"
For this part, we have to cut it in 2 : Z and PS.
Z is just there to make it look futuristic, "science-fictionish", but it has no real
meaning.
PS are my initials. S stand for Samuel (or Sam), and P for my family name (not
revealed here for obvious reasons).
A remark about the pronounciation : as a French-speaker, It's easy for me to say it.
But I know many of the English speakers just cut it and say simply
[menta]
The correct pronounciation is
[mãtaz3dpe3s] as I say it in French.
(sorry for phonical symbols, they aren't quite right, especially for the
[3] sound, it's the sound you say as in the word "said"
[s3d] , for example. It's not a "three" but it should be a "3" mirrored.
But don't bother with that and simply call me Sam....^_^
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There you are everyone. The mystery is revealed !