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CAPTCHA
Contributed by: Gladish
Note:
 Alan Turing 
The Tuing test is a test, developed by Alan Turing in 1950,
 of a machine's ability to exhibit intelligent behavior equivalent
to, or indistinguishable from, that of a human.
A CAPTCHA (a backronym for "Completely Automated Public Turing test to tell Computers and Humans Apart") is a type of challenge-response test used incomputing to determine whether or not the user is human.
A backronym or bacronym is a specially constructed phrase 
that is supposed to be the source of a word that is, or is claimed
 to be, an acronym. Backronyms may be invented with serious 
or humorous intent, or may be a type of false or folk etymology.
Note:
C
?
A
?
P
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T
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C
H
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A
backronym 
Completely
?
test
?
and 
?
to 
?
Automated
?
Humans
?
tell
?
Public
?
Computers
?
Apart
?
Turing
?
Completely
?
Computers
?
Automated
?
Humans
?
Turing
?
Public
?
Apart
?
test
?
and 
?
to 
?
tell
?
Luis von Ahn (born 19 August 1978) is a Guatemalan 
entrepreneur and anassociate professor in the 
 He was part of a team that claimed inventorship of CAPTCHAs.
 He is known as one of the pioneers of crowdsourcing.
 He is the founder of the company reCAPTCHA, 
which was sold to Google in 2009,[3]
and the co-founder and CEO of Duolingo, 
a popular language-learning platform.
 He was part of a team that claimed inventorship of                     .
Luis
?
                        (born     August 1978) is a entrepreneur and an associate              in the Computer               Department at Carnegie Mellon University.[2
 He is known as one of the pioneers of                           . 
von
?
 He is the founder of the company                          , which was sold to               in 2009,[3]  
and the co-founder and CEO of                    , a popular language-learning platform.
Ahn
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Science 
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19
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Google
?
professor
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Duolingo
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reCAPTCHA
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Guatemalan 
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crowdsourcing
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CAPTCHAs
?
Mr. G
For more info on  CAPTCHAs
click here
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