8/30: 60k evacuate ahead of dam's "imminent failure"; Mitt Romney's big night

Workers searched through what was left of Plaza Towers Elementary School, which was demolished by the tornado in Moore, Okla. As Anna Werner reports, in many neighborhoods, there isn't much left to salvage; Also, although neighborhoods were destroyed by Monday's tornado, the community of Moore, Okla., has come together; And, around 60 people were still hospitalized Tuesday with injuries they sustained when the tornado plowed through Moore, Okla. Scott Pelley talks to Dr. David Hogan, who helped treat many of the patients who were rushed to his hospital Monday night.

David and Anna Friess lost almost all of their possessions in Monday's tornado, but they could have lost more, if not for a last-minute decision; Also, a tour of neighborhoods in Moore, Okla., reveals many homes weren't just damaged by Monday's massive tornado - they were destroyed; And, one resident of Moore, Okla., lost her home to a tornado for a second time Monday.

The twister that plowed through Moore, Okla., injured more than 300 people and caused at least 24 deaths ; Also, a third-grade teacher at Plaza Tower Elementary School in Moore, Okla., did everything she could to save her students; And, Glenn Lewis, the mayor of Moore, Okla., was there in 1999 when another tornado devastated the city. He speaks to Scott Pelley about how the town will rebuild following Monday's disaster.

At least 51 people were killed in the massive tornado that hit Moore, Okla; Also, Dean Reynolds speaks to Bonnie Esrig, a retired employee of the IRS office that's accused of political targeting. She says that in her 24 years in the office under two Democratic and two Republican presidents, she never heard anyone say, "The president wants this done."

The intense weather is not over for people living in the middle of the country. From Oklahoma City to Minneapolis, severe weather is still a threat. One family hit hard shares their story of survival with Anna Werner; And, A winning lottery ticket worth $4.8 million saved a home from foreclosure, a gift the family claims is from their own guardian angel A multi-million dollar payout from a winning lottery ticket saved a home from foreclosure in Chicago, and the family swears it's all because of their own guardian angel. Dean Reynolds reports.

During rush hour in Connecticut, two commuter trains collided, sending 72 passengers to the hospital. The tracks are now closed while the NTSB investigates. And as Don Dahler reports, it's creating a travel nightmare; And, after his close friend died from pancreatic cancer, 16-year-old Jack Andraka unleashed his hyper-drive intellect on preventing more cancer deaths. And as Jim Axelrod reports, the teen created a much faster and far cheaper detection method for pancreatic, ovarian and lung cancer.