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month. why mammograms fail to detect tumors in some women. cbs roxana saberi has the questions every woman should ask their doctor. >> this is the "cbs evening news" with norah odonnell, reporting from the nations capital. >> odonnell: good evening, and thank you for joining us. were starting tonight with horror in the heartland of america. another school shooting, this time in st. louis. it happened today at the citys central visual and performing arts high school. terrified student l...