US scientists have announced two advances in adult stem cell research. A team at Duke University, in North Carolina, has found that most adult fat cells are actually reprogrammable stem cells which can help repair damaged tissues. It was already known that fat cells from liposuction can grow into bone, cartilage, fat and nerve cells, but now it appears that at least 62% can grow into two other types as well. And at the University of Pennsylvania, researchers have managed to coax stem cells from the hair follicles of mice to grow into new hair. The procedure offers new hope for reversing baldness.