January 1, 2010
2
PlayGuest question from p vs np, the latest GQHero 
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Connect the entry recorded in a ledger from the Renaissance era (1) to the computer geek (2).
Cracked By: p vs np , shrik , Rogi , Logik and Advaith
Answer:
The @ symbol
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January 1st, 2010 at 11:06 pm, GMT +0000 ( 1262387187 )
Arroba became *at* became *@* which Ray used as a way to separate accounts from servers to address emails in ARPANET.
January 1st, 2010 at 11:27 pm, GMT +0000 ( 1262388460 )
Arroba sign at some ariza place. @ – monkey’s tail sign. Ray tomlinson. Email.
January 3rd, 2010 at 8:11 am, GMT +0000 ( 1262506263 )
The @ symbol
Historian Jorge Romance located the appearance of the Arroba (@) symbol at the “taula de Ariza” registry from 1448 (Pic 1), to denote a wheat shipment from Castile to the Kingdom of Aragon. (http://en.wikipedia.org/wiki/Arroba)
BBN’s Ray Tomlinson (Pic 2) is acknowledged for having introduced the @ symbol in the usages we see today.
January 4th, 2010 at 1:53 am, GMT +0000 ( 1262570004 )
1 is on of the more ancient uses of the @ symbol called the Arroba, as a unit of measure.
2 is the more popular ‘inventor’ of the @ notation for emails – Ray Tomlinson
January 4th, 2010 at 6:49 am, GMT +0000 ( 1262587773 )
@ sign used by ray tomlinson in the first e mail