I like physics because you're trying to
answer big questions about the universe
and about why it is that things are
the way they are. You don't answer that
question from one day to the next. Actually you're lucky if you get an
answer to that kind of question once in
a lifetime. But from one day to the next
you do answer smaller questions. And
often it's like a detective story.
You start off with a problem, you don't know what the answer is. You look for clues
and you get an idea of what direction to go in. And maybe the end of it you think you know the answer.
And then you check it to see if it's actually really at the right answer.
To me, if physics were a piece of
art, it would be a bit like a symphony orchestra playing
only you don't hear the symphony orchestra, you just hear the double basses
and what you're trying to do, is to work out what the rest of the instruments are playing
just based on the little bit that you hear.
Changing your mind? 
Changing my mind is part of being a scientist.
You do it all the time. 
It's ...
Changing my mind is part of being a scientist.
You start off with a hypothesis, with an idea
but then, evidence might come along 
that doesn't agree with that idea.
And you have no choice but to change your mind
and that's when it's fun
when you have a surprise.
And you're forced to rethink your preconceptions.
