Why the tail is helpful (not explained in the video): http://www.sciencedaily.com/releases/2008/03/080317171030.htm http://www.sciencedaily.com/releases/2008/03

Why the tail is helpful (not explained in the video): http://www.sciencedaily.com/releases/2008/03/080317171030.htm http://www.sciencedaily.com/releases/2008/03/080317171030.ht...