Pretty much any spark, from the static shock you get from touching a doorknob to the giant bolts that light up Jupiter's turbulent atmosphere, could be considered lightning, he said.

A zap of electricity to the brain can make you a bright spark at maths.But shock the wrong spot and you could be as bad with Numbers as a six-year-old, according to a new study.

Without passion man is a mere latent force and possibility, like the flint which awaits the shock of the iron before it can give forth its spark.