Some years ago I read the book Sync by Steven Strogatz. Now, Ted has posted a presentation by him, titled: How things in nature tend to sync up (I am posting the Youtube version here). It is very interesting to watch. Some beautiful pieces of film with flocks of birds, school of fish, and so but also some fascinating examples of inanimate objects synchronizing with each other. It is still largely an open question to me what all of this implies for human behavior but it is surely interesting to think about that question.