@nationalspacesociety: Astronaut Karen Nyberg demonstrates how to wash long hair in microgravity aboard the International Space Station, where water doesn’t fall downward and instead clings to the scalp in floating blobs because of surface tension. The process takes specific tools, careful maneuvering, and a lot more control than washing your hair on Earth, especially since astronauts have to avoid wasting water. Credit: NASA Johnson #spacetok #NASA #ISS #astronaut