Sumo legend retires - Takanohana, one of two current yokozuna, or Grand Champions, has retired, after over a year of nursing injuries. One of the admirable aspects of this sport, is that if you've reached the top rank, you're expected to retire on your own if you feel that you're losing your edge. Wrestlers are promoted and demoted by the sport's governing body in the lower ranks, but the top ranks carry the tradition and honor of Sumo, and are expected to protect it by avoiding the equivalence of the has-been or the punch-drunk boxer. Classy. Prior to Takanohana, the last yokozuna to retire was Akebono -- a US-born superstar. Remaining at the top rank is Musashimaru, also one of the few non-Japanese natives in the sport. Up-and-coming ozeki (second rank) Asashoryu, from Mongolia has a shot at filling the spot left open by Takanohana, if he is sufficiently successful in the current tournament.