| http://www.w3.org/ns/prov#value | - It would be tough to think up a more plum assignment for a test subject: Simply step into an empty room, sit down, and think.Just think.But in a study to appear in Thursday???s issue of the journal Science, participants found the experience within their own heads surprisingly difficult to manage ??? if not downright unpleasant.Stripped of their books, cellphones and other distractions, many, inclu
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