Week 234 of John Baez’ This Week in Mathematical Physics is up. Most of this week’s edition is about the relationship of mathematics and music, but he does touch on a topic we’ve discussed before: weird orbits in classical mechanics. Cris Moore and Michael Nauenberg have found many new and strange solutions to the n-body problem and have provided movies (animated GIFs). The most amazing one is 21 bodies all moving along the same figure eight orbit.