Thanks everyone. Jgnat, I'm afraid what some will do with the "coal" statement
Don't worry about the big head, life has a way of humbling me on a regular basis.
May I quote Isaac Newton (or John Salisbury):
"If I have seen further, it is by standing on the shoulders of giants."
Sir Isaac Newton, in a letter to fellow English scientist Robert Hooke (5 February 1675 or 1676).
It seems to be a paraphrase of an 11th century monk named John of Salisbury.