CHICAGO (Reuters) - Internet business networking service LinkedIn allowed users to connect with Ernest Hemingway. Coupon hawker Living Social offered salami-based spa treatment. Photography giant Eastman Kodak offered pain-free permanent photo tattoos. Has the world gone mad? No. It was just another April Fool's Day, the international day of tomfoolery when pranks, hoaxes, and practical jokes remind us not to take ourselves...
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