Spending time in space may cause astronauts' brains to float upward

Spaceflight is known to take a toll on the human body, and now it seems that living in zero gravity can even reposition a person’s brain in their head. Brain scans of astronauts have revealed that long stays in space can cause the brain to shift upward in the skull and lessen the amount of protective fluid surrounding the brain. It’s unclear exactly how these brain changes affect an astronaut’s health, but the findings could have implications for how NASA keeps crew members hea