For Certain Tasks, the Cortex Still Beats the CPU (archiving magazine articles 7/2007)

For Certain Tasks, the Cortex Still Beats the CPU:

"But reCaptcha has an even sneakier — and more delightful — purpose. The words are pulled from the book-scanning project of the Internet Archive, a nonprofit project in San Francisco that aims to digitize millions of public-domain books and put them online for free. One of the two words in the test is the control word: The gatekeeper computer knows what it should be, so it's there to make sure the puzzle-solver is indeed human. But the other word is there for a different reason. The Archive's scanners are good, but some of the words are too smudgy for the software to decipher. The game takes the image of each smudgy word and puts it into reCaptcha. Each time someone completes a reCaptcha puzzle, they'll be doing a tiny bit of work — translating that difficult image into text, which von Ahn eventually feeds back into the Archive."