I did not imagine that the second half of my life would be spent on efforts to avert a mortal danger to humanity created by science.

The most terrifying moment in my life was October 1962, during the Cuban Missile Crisis. I did not know all the facts - we have learned only recently how close we were to war - but I knew enough to make me tremble.

We appeal, as human beings to human beings. Remember your humanity and forget the rest. If you can do so, the way lies open for a new paradise; if you cannot there lies before you the risk of universal death.

At a time when science plays such a powerful role in the life of society, when the destiny of the whole of mankind may hinge on the results of scientific research, it is incumbent on all scientists to be fully conscious of that role, and conduct themselves accordingly.

Life is half spent before we know what it is.

Half our life is spent trying to find something to do with the time we have rushed through life trying to save