Scientists believe they've discovered stem cells in the lung that can make a wide variety of the organ's tissues, a finding that might open new doors for treating emphysema and other diseases.
The nation's first full face transplant recipient has made his first public appearance since his operation.

The nation's first full face transplant recipient said the first thing his young daughter told him when she saw him after the operation was "Daddy, you're so handsome."

The nation's first full face transplant recipient said the first thing his young daughter told him when she saw him after the operation was "Daddy, you're so handsome."
The nation's first full face transplant recipient said the first thing his young daughter told him when she saw him after the operation was "Daddy, you're so handsome."
The nation's first full face transplant recipient is scheduled to make his first public appearance since his operation.
Doctors at a Boston hospital have performed the nation's second full-face transplant, less than a month after the first.
Reports of sleeping air traffic controllers highlight a long-known and often ignored hazard: Workers on night shifts can have trouble concentrating and even staying awake.

A Texas construction worker badly disfigured in a power line accident two years ago has received the nation's first full face transplant at a Boston hospital.