He lies in a glass sarcophagus, his reddish moustache trimmed and his hands resting on his thighs. Dressed in an austere black suit, Vladimir Lenin, the first Soviet leader, looks at first to be a waxwork. Yet this is in fact the preserved body of a man who died 92 years ago. If carefully monitored and re-embalmed regularly, scientists believe he can last in this state for centuries more. But it...