John Mather: I think when I was younger, I just didn’t know what I could accomplish.  I didn’t start out with a plan to do anything particular.  Most of my life was not planned in advance.  I didn’t know where I was going to go.  Mostly, I would say, my life strategy has been to respond to opportunity. And then when somebody gives you a responsibility, then stick to it.  So it’s worked out.  I didn’t have a plan when I left Berkeley to build this COBE satellite.  In fact, I was going to do something else, because I thought it was too hard.  But somebody said, “Well, write a proposal.”  I thought, “Well, it’s pretty unlikely to be chosen, but it might be and that would be glorious.”  So then when we got a chance to do it, of course I said yes.  Then when it turned out to be a lot harder than people thought, well, okay, I’ll stay with it anyway.  So I don’t give up.  I think that’s part of the achievement.  I think that’s what we’ve heard from a lot of the other speakers at this event as well today — that you just don’t give up.  When something is hard, you just get more resources and keep on going.