A study explains how age reshapes the blood system. In both humans and mice, a few stem cells out-compete their neighbors and gradually take over blood production. The loss of diversity results in a ...

Changes in blood are detectable at age 50 and universal by 60, paving the way for spotting early signs of unhealthy aging.

Scientists have found a way to sample DNA out of the air on a large scale — making it possible to one day track the health ...