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Physical sciences/Physics/Astrophysics/Astrophysical plasmas/Nebulae

When Anil Dash needed a new mobile phone, he asked his Twitter followers and Facebook friends for suggestions. He received several recommendations, but he was surprised by a response that included a link to a paper listing popular mobile phones and how much radiation they emit.

That experience showed Dash how social networks can help people not only answer questions but also consider issues related to their questions that may not have occurred to them otherwise.