"If the world were to blow itself up the last thing you would hear would be the voice of an expert saying it can't be done." --Peter Ustinov

Don't pay too much attention to the experts. They told the Beatles that the time for a guitar group had passed! At least one of them, Paul McCartney, is still going strong.He played at half-time at the Superbowl in 2005. Not bad for someone whose time had passed.

Stephen Hawking was diagnosed with motor neurone disease at the age of 21. He was given two years to live. He went on to get married and have three children and became one of the greatest theoretical physicists that the world has ever known.

He is now Professor of Mathematics at Cambridge