I think chemistry is just so fundamental, that reactions can happen and you can make things that you could never make before.  When you look at the world around us, chemistry just is so fundamental to everything.  I mean, it makes the clothes you wear, it makes all of the materials that exist — synthetic materials in the world — cars, the airplanes, everything is done by chemistry.  At the same time, chemistry provides a tool to understand so many things: how cells work, how drugs work.  So to me it’s just such an incredibly fundamental science.