One thing that being a scientist has taught me is that you can never be certain about anything. You never know the truth. You can only approach it and hope to get a bit nearer to it each time. You iterate towards the truth. You don't know it.
If it hadn't been for the Cold War neither Russia nor America would have...
If you've never felt that you quite got a hold of it you just feel that...
My mom is always telling me it takes a long time to get to the top but a short time to get to the bottom.
