5th April

On this day in 1955, Bertrand Russell sent a letter to Albert Einstein with a rough draft of what would soon be known as the Russell-Einstein Manifesto - a written warning to the world's population on the dangers of nuclear weapons, and a plea for all leaders to avoid war when faced with conflict - and asked him to be both a signatory and supporter.

The postage stamp of one of today's mathematicians at THIS LINK was issued in 1944.