Space station investigation goes with the flow

On Earth, blood flows down from a person's brain back toward the heart thanks in part to gravity, but very little is known about how this flow happens in microgravity. Many crew members aboard the International Space Station report headaches and other neurological symptoms in space, which may be related to microgravity's effect on cerebral blood circulation. The Drain Brain investigation, which was completed in July 2015, measured the blood flow from the brain to the heart of one crew member to