Hobbies

If I study another branch of science completely unrelated to medicine just for fun, do I put in a hobby entry dedicated to just that one hobby? Or should I mix it in with my other hobbies in one hobby entry? If it helps, if I am asked about it in an interview, I can explain it in-depth while keeping it in layman's terms and blow away my interviewer.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums