2/6: Postal Service to drop Saturday delivery; Mali historical documents saved

      |The cash-strapped U.S. Postal Service has announced that it will drop Saturday mail delivery starting in August. Nancy Cordes reports on what's next for America's second largest civilian employer; And, when the center of Islamic culture in the fabled city of Timbuktu was invaded by Islamic extremists, one of its keepers sprang to action and saved thousands of historic documents from being destroyed.

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