Snippet from the article:
Dr. Karen Nyberg is a flight engineer on the International Space Station—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!