As any comic book reader knows, the citizens of Gotham City have a handy way to call for help. Just power up the Bat-Signal and Batman will swoop to the rescue. It turns out that superheroesin- training are just as ready to answer the help call in communities around the world. A new online game called Evoke, promising “a crash course in changing the world,” had attracted more than 13,500 players from 130 countries soon after it launched in March. Their mission during the 10-week game: Learn...


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