The life we have on Earth must have spontaneously generated itself. It must therefore be possible for life to generate spontaneously elsewhere in the universe.

While there's life, there is hope.

The beatings will continue until morale improves.

Time travel was once considered scientific heresy, and I used to avoid talking about it for fear of being labelled a 'crank.'

No one can resist the idea of a crippled genius.

[In the Universe it may be that] Primitive life is very common and intelligent life is fairly rare. Some would say it has yet to occur on Earth.

We are in danger of destroying ourselves by our greed and stupidity. We cannot remain looking inwards at ourselves on a small and increasingly polluted and overcrowded planet.