6/21: Zimmerman tells his story; Moody's downgrades big banks

      |George Zimmerman details to investigators what happened the night the he fatally shot Trayvon Martin; Also, Moody's ratings agency downgraded several of the biggest banks in America; And, Burmese activist Aung San Suu Kyi addressed both houses of British Parliament - only the second woman ever to do so.

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