Secret Obsessions is Atlas Obscura’s new column where we ask wondrous people to take us down a rabbit hole. This edition features American astronaut Jessica Watkins, as told to Associate Editor Sarah Durn. I really kind of stumbled into rugby. It started at an activities fair at college. I played basketball and soccer and ran track in high school, so when I got to Stanford I wanted to pursue something athletic. I ended up chatting with the women at the rugby booth. The team had just come off winning a…