In this short clip, Astrophysicist Neil deGrasse Tyson, Friends' 2010-11 Visiting Scholar, teaches Middle School students about the elliptical orbit of Pluto. Over the next three school days, Tyson will work with chemistry, physics, and biology students. An open lecture wlll take place Nov.1 in the Meetinghouse. To attend, email aeisner@friendsseminary.org.