From Science For Seniors, news of progress in understanding osteoporosis, the commonplace decrease in bone density with age. Osteoporosis is high up on the list of long-term worries for healthy life extensionists, alongside degenerative conditions like Alzheimer's. Bone mass loss is slow but eventually crippling, so it is definately a concern. According to this article, the research raises the strong possibility of a stem cell based therapy to cure this condition. Kudos to the researchers!