Just ask Google, which now has arranged for anyone to search millions of books online and track how many times a particular word has been used through the ages, thus suggesting how much we think about ...
Science 12 September 2008: Vol. 321. no. 5895, pp. 1465 - 1468. In last week’s issue of Science magazine, Luis von Ahn and his colleagues write about CAPTCHAs, that is Completely Automated Public ...
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