The problem is, it's hard to prove. Journals deny it. But some academics say they've experienced it firsthand.

A woman who received a uterus transplant recently delivered a healthy baby boy. NPR's Mary Louise Kelly talks with the doctors working on the experiment about its ethics, risk, and cost implications.

The country's top public health advocate says the cycle of opioid addiction won't be stopped without more money from Congress and cooperation among federal, state and local officials.

A long-term study of people who survived Hurricane Katrina found that most were doing well, and some feel the experience transformed them. But others remain haunted by anxiety and depression.