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.

Web Extra: Following a close friends death from pancreatic cancer, 16-year-old Jack Andraka created a much faster and far cheaper detection method for pancreatic, ovarian and lung cancer. Jim Axelrod speaks with the teen innovator about his favorite awards.

Parts of the plains and Midwest are under the threat of severe weather, including possible tornadoes. Jim Axelrod speaks with CBS News weather consultant David Bernard about what to expect in the coming days.