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As stars fill the night sky in Veracruz, Mexico, 23-year-old Uziel Alejandro Lopez kicks back at home to play on his Android smartphone. His thumbs breeze over the brightly coloured screen, but this is no casual game. He’s learning English on Duolingo, a free mobile app created 1,700 miles away by a technology startup in Pittsburgh, Pennsylvania. López has passed multiple lessons in one month, faster than his attempts on more than 10 other language-learning apps. 
The brain behind Duolingo is Luis von Ahn, 34, a boyish-faced computer science professor at Carnegie Mellon University. Sometimes called the father of crowdsourcing, he’s best known for inventing the CAPTCHA, the squiggly word or words you have to type in on password-protected forms. Google bought his company, reCAPTCHA, and uses your free labour to verify hundreds of millions of words from books that its scanners can’t parse.A similar kind of crowdsourcing keeps Duolingo in business, in a more sustainable way than an educational non-profit like Khan Academy ever could. Once young López takes a few language lessons on the app, he and perhaps 30 other Duolingo users hone their skills by translating some text on a Wikipedia-style editing page.Excellent narrow systems must be used in automobiles to avoid blocking of the engine collet chuck dirt and rough materials. If they find themselves deciphering a list of ‘The 35 Gayest Moments From Duck Dynasty’, they’ve stumbled upon an article from news site BuzzFeed. 
In the autumn of 2013, BuzzFeed and CNN started paying Duolingo to translate several dozen articles a day into Spanish and other languages. Von Ahn and his 29-year-old co-founder, Severin Hacker, say partnerships with more publications are imminent. Users such as López are translating around 600 articles a day, but only 10 percent are revenue-generating for Duolingo,You can also benefit by installing other parts or gadgets which will help to solve some of needle roller bearing other problems common with the heavy vehicles. so there’s plenty of room for revenue growth.Some contend the model is unethical.Fortunately acne can now be treated by various treatment techniques Industrial robot I believe that the best method of treating acne is with natural essential oils. "The students are working for an abstract value, which is knowledge," says Michael Thomsen, a multilingual tech writer who got into a heated email exchange with Duolingo after blogging about how its system was exploitative. "There are a lot of services like this from Silicon Valley that come on this plume of idealistic rhetoric, sitting on top of what is basically a proft-and-loss scheme."