What is Invisible?

John Lloyd seems to have known every brilliant and funny person in Britain, and his collaborations are legendary. He's been a fixture on the BBC for four decades, producing such classic comedies as Blackadder, Spitting Image, the BBC's Hitchhiker's Guide to the Galaxy and lately QI, hosted by Stephen Fry, and now in its sixth season. He's also written a dozen funny books -- including The Meaning of Liff, a collaboration with his friend Douglas Adams, which has been in print for 26 years.

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How much of the world around us is invisible? Nature's mysteries meet the sharp wit of writer, comedian and television producer John Lloyd.