| http://www.w3.org/ns/prov#value | - The common desire to stay mentally sharp, particularly in life???s later years, is giving rise to for-profit brain trainers" and Web sites offering mental exercises for a fee.But not everyone is sold.Sites such as PositScience.com, HappyNeuron.com and MyBrainTrainer.com, and computer programs as MindFit by Vigorous Mind and the Brain Age game by Nintendo, offer puzzles and challenges that can fee
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