CAPTCHA stands for "Completely Automated Public Turing test to tell Computers and Humans Apart".
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Amazon sells more e-books than printed books.
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Mathway.com solves all kinds of math homework problems with step by step explanations.
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MDIF, a New York based non-profit organisation, is planning to beam free Wi-Fi to the entire world from space.
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After coming across a "very sweet" homeless man from Jamaica named Michael on a night out, Londoner Jenny Baker took to Twitter, and within hours, using the hashtag #getmichaelhome, had raised thousands of pounds so that he could return home to Jamaica where he said he would be "happy again".
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