When I was 12 I closed Hawking's book "The Universe in a Nutshell" and said to myself that this is what I wanted to do, and that I was going to go to Cambridge. Oh, and then become a professor, if memory serves. I don't think I can be accused of having no ambition. Nor is it fair to say I have no imagination. What some people do seem to not appreciate is that imagination on its own can, in some fields, only take you so far. At some point, you actually have to start learning something. Along the way, you might find that some things you had imagined about are (probably) impossible. This isn't a crushing realisation, because at around the same time you also learn about a whole wealth of other things that you'd almost certainly never have been able to imagine in your wildest dreams. There's a trade that, as far as I can see, is seriously worth it. I don't think it's that different in some ways from what you might think the view is going to be from the top of a hill and what it turns out to be when you get there. Often it's nothing like you expected, but it's still just as fantastic -- and while you might not be able to see something you were hoping to see, you get to see many things that you'd never have thought of that are just as wonderful, if not more so.
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kvalidir... I suppose I was just too shy. And while I was once outside his office on a quiet afternoon, contemplating knocking on the door and saying hello, I don't think I'd ever have been able to do it. Might have ended up star-struck and tongue-tied.