An unidentified heckler lets loose as President Obama begins a speech at the Martin Luther King memorial dedication in Washington, D.C., in October 2011. Mannie Garcia/UPI/Landov hide caption

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Breaking Out Of A Web Of Fear
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Humans, The World's 'Superomnivores'
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How Do Rules Fail Us?
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Can Video Games Solve Real Issues?
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How Can Social Media Make History?
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'The Garbage-Men' Rock A Trashy Sound
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