This edition of Scientific American Mind contains seven fascinating articles. First, discover the science behind your gut instinct. You'll also learn how antidepressants designed for adults may be altering the brains of children. You'll hear about a growing body of research that's showing how working in groups can systematically enhance performance. There's also news about the connection between abnormal sleep patterns and disease, and a report on the science of speech. Plus, find out how to determine if you're getting useful guidance from so-called experts, and learn about a new way stroke victims are regaining lost abilities.
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