This is John Batchel. A quiz, a fun quiz with Simon Constable, my colleague in the South of France.

Ten questions. This one compelled me because it was, well, I call it science fiction.

How much energy coming from the sun in one hour to the earth? How much energy?

Simon introduces the possibilities, multiple choice.

Here's Simon Constable, writing for the Wall Street Journal about solar energy, more of this tonight.

The amount of energy from the sun's rays hitting the earth for one hour would power the whole world for how long.

I love this question, Simon.

It's science fiction. The answer itself is kind of amazing. Please explain. There is an awful lot of energy coming out of the sun. So I put the questions down to a hour, B, a day, C a week, D, a month, and E a year.

And the clue I gave you there was that the amount of energy coming out of the sun is just really quite unbelievable.

It's a year.

So in one hour, the amount of energy from the sun's rays hitting the earth would power the entire world for a year.