Researchers at Oregon Health and Science University have achieved a longtime goal. They cloned a human embryo to derive embryonic stem cells able to transform into tissues and organs genetically identical to patients who need them. Jeffrey Brown talks to NPR's Rob Stein about the science as well as the ethical concerns.

In a New York Times op-ed, actress Angelina Jolie disclosed she had a preventative double mastectomy because she carries a greater genetic risk of developing breast cancer. Gwen Ifill talks with genetic counselor Beth Peshkin of Georgetown University and Dr. Kenneth Offit of Memorial Sloan-Kettering Center in New York.

There's new evidence that being fit reduces your risk for getting cancer. The study, released at the American Society of Clinical Oncology's annual meeting, looked at the link between fitness in middle-aged men and the likelihood of a cancer diagnosis later in life.

Angelina Jolie announced today that she has undergone a preventative double mastectomy due to a gene she has that increases her risk of of developing breast cancer and ovarian cancer. What makes this gene so devastating and who is affected by it? We talked to a leading oncologist Dr. Sandra Swain for answers.

The City Council is debating proposals, including raising the minimum age for buying cigarettes.

In The Anatomy of Violence, Adrian Raine says violent behavior, like depression, is biological.

Research shows older ads may have encouraged teens to try drugs; newer ads may be more effective.

They're not regulated like other tobacco products, but the FDA warns that day may yet come.