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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 o'donnell, reporting from the nation's capital. >> o'donnell: good evening to our viewers in the west, and thank you for joining us. we're starting tonight with horror in the heartland of america. another school shooting, this time in st. louis. it happened today at the city's central visual and performing arts high school. terrified students leaving their school with hands raised, escaping the senseless horror of bull...

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 o'donnell, reporting from the nation's capital. >> o'donnell: good evening, and thank you for joining us. we're starting tonight with horror in the heartland of america. another school shooting, this time in st. louis. it happened today at the city's central visual and performing arts high school. terrified student leaving their school with hands raised, escaping the senseless horror of bullets and bloodshed ...

endangering the lives of civilians who could be caught in the crossphile. jurlists, three being held after five days at the tripoli hotel. cnn's chaunce was one of them. steve jobs will step down. jobs is on his third medical leave of absence. he didn't mention his health problems directly but he said the time has come to resign. portions of the u.s. east coast are likely to be under a hurricane watch in just a few hours. hurricane irene is tearing through the bahamas right now with sustained winds at 160 miles an hour. it could hit the populated, northeast this weekend. those are ...

broker a ceasefire. meantime, a bombshell in the business world to tell you about. steve jobs steps aside as apple's ceo. we'll hear who's in line to replace the long-time leader. and hurricane irene batters the dominican republic, is over the bahamas and is heading towards the united states. full coverage of all these stories is straight ahead. -- captions by vitac -- battles, bounty and an offer to broker a ceasefire. we begin this hour with developments from libya. fighting continues to rage in the capital as rebels take on pockets of resistance. gunfire can be heard in the ...

$823 million in retiree health benefits, that's what it's costing the state. just from retirees' health benefits. that is crazy and we can't do it anymore. bill: he's trying to change this, can he or is it wishful thinking? >> well, i think it's the right wish, and yes he can, and the reason he can, bill, is because his historical -- historic election in new jersey, governor mcdonald's historic election in virginia, scott brown's historic election in massachusetts, all give evidence to the fact that the american people are tired of the borrowing, the spending, the bailouts, and the takeovers, ...