The Cold War is over but Cold War thinking survives.

Indeed, the very first resolution of the General Assembly of the United Nations – adopted unanimously – called for the elimination of nuclear weapons.

When the START 2 treaty has been implemented – and remember it has not yet been ratified – we will be left with some 15,000 nuclear warheads, active and in reserve. Fifteen thousand weapons with an average yield of 20 Hiroshima bombs.

We are told that the possession of nuclear weapons – in some cases even the testing of these weapons – is essential for national security. But this argument can be made by other countries as well.

All nuclear weapon states should now recognize that this is so, and declare – in Treaty form – that they will never be the first to use nuclear weapons. This would open the way to the gradual, mutual reduction of nuclear arsenals, down to zero.

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.

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.

My short-term vision is the abolition of nuclear weapons. My long-term vision is the abolition of war.

When the START 2 treaty has been implemented - and remember it has not yet been ratified - we will be left with some 15,000 nuclear warheads, active and in reserve. Fifteen thousand weapons with an average yield of 20 Hiroshima bombs.

From my earliest days I had a passion for science.