Letter Bomb
When Gordon Brown took office as the UK’s Prime Minister, he had to write a letter, in his own hand, giving instructions detailing what the UK’s response should be in the event of a pre-emptive nuclear attack.
Hidden Messages
Steganography – the art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message; this is in contrast to cryptography, where the existence of the message itself is not disguised, but the content is obscured
