Gwen Moten remembers her childhood friend, Denise McNair, who died with three other girls in the 16th Street Baptist Church bombing in Birmingham, Ala., in 1963. StoryCorps hide caption

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The Congressional Gold Medal has been posthumously awarded to four girls killed in the 1963 bombing of Birmingham's 16th Street Baptist Church. President Obama signed the legislation Friday, as (from left) Birmingham Mayor William Bell, Dr. Sharon Malone Holder, Attorney General Eric Holder, Rep. Terri Sewell, and relatives of Denise McNair and Carole Robertson look on. Pool/Getty Images hide caption

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Residents survey the destruction after a tornado hit Pratt City, Ala. just north of downtown Birmingham, Ala. on Wednesday, April 27, 2011. Butch Dill/AP hide caption

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