The annoying "prove you are a human being by showing that you can read messed-up letters" is called a CAPTCHA, which is an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart".The "Turing test" is a fascinating test proposed by Alan Turing in 1950, and important to computer scientists, theorists, and dabblers in Artificial Intelligence. You can read about it at Wikipedia's entry about Turing test
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