Most of us only ever see our food delivered in plastic wrapping on the supermarket shelf. But where does it really come from? Who grew it, and how? How does fertilizer, salt, and water fit in all this.

And what is going to happen as the world supply of oil and gas can no longer meet demand. You've heard of Peak Oil, but what of Peak Phosphorus?

Also a look at what it means to get your science book published.

Richard Stirzaker, author of Out of the Scientist's Garden joins Nyssa Skilton and Rod for this show.

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