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According to the article:

Captchas — those puzzles used by e-commerce sites that require people to type in a set of distorted letters and numbers — are easy for humans to read and retype but difficult for machines to decipher.


Not so sure I agree with this.
I had to decipher a "captcha" in order to leave a message the other day on Sandra's blog and i nearly gave up without commenting. It was just too difficult - It took several attempts at different "words" - and I was wearing my glasses. :(

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