Snippet from the article:
Dr. Karen Nyberg is a flight engineer on the International Space Stationâ€”and she happens to have long hair. So how does she wash her hair in space? It turns out to be an easy process, though a visually striking one. Due to the lack of gravity, her hair sticks straight up, so she ends up washing up rather than our Earthbound, gravity-centric “water flows down” thinking.
See the video at Mental Floss — Washing Your Hair in Space
I have often wondered about the other essential body functions in space, but did not feel it was a necessary project for my busy mind prior to seeing the video. Click on the above link to check out the video!