There was no race - but to the extent that there was an arms competition, it was almost entirely on the Soviet side, first to catch up and then to surpass the Americans.

From a scientific perspective there is some indication that a nuclear war could deplete the earth's ozone layer or, less likely, could bring on a new Ice Age - but there is no suggestion that either the created order or mankind would be destroyed in the process.

Risk-taking is the essence of innovation.

Nevertheless, during the sixty years of the twentieth century many problems have come increasingly into the realm of acceptable public discussion.

There was no race - but to the extent that there was an arms competition, it was almost entirely on the Soviet side, first to catch up and then to surpass the Americans.

The objective of nuclear-weapons policy should not be solely to decrease the number of weapons in the world, but to make the world safer - which is not necessarily the same thing.

In a world which is armed to its teeth with nuclear weapons, every quarrel or difference of opinion may lead to violence of a kind quite different from what is possible today.