A model is a good model if first it interprets a wide range of observations in terms of a simple and elegant model, and second if the model makes definite predictions that can be tested, and possibly falsified, by observation.

The real challenge is to work out what aliens might actually be like.

The universe doesn't allow perfection.

We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.

Scientists have become the bearers of the torch of discovery in our quest for knowledge.

It is a waste of time to be angry about my disability. One has to get on with life and I haven't done badly. People won't have time for you if you are always angry or complaining.

If one is physically disabled, one cannot afford to be psychologically disabled as well.