World leaders eye Greek election

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.

Instead of celebrating graduation day, students at Hofstra University on Long Island are mourning a classmate accidentally killed by a police during a confrontation with an armed suspect. Terrell Brown reports.

Crews are just starting to rebuild hundreds of track south of New Haven, Conn., after a train collision Friday night sent 72 people to the hospital. The missing track will cause an ugly commute for thousands. Don Dahler reports.

President Obama's senior adviser, Dan Pfieffer, told "Face the Nation" the White House had only heard of the IRS probe this month -- but that has done nothing to quite conservative critics. Sharyl Attkisson reports.

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.

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.