In middle school, Alex Fong would spend 15 hours a week on Yahoo Answers, helping strangers sort through their aquarium conundrums. He answered questions like: “Why are my fish sick?” “What can I do with this 10-gallon tank?” “What fish can live together?” To address the tougher questions, he poured over aquarium books. He tried to make his answers detailed and long. After a month of posting, he earned the “top contributor” designation—with 477 points and a 79…
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