The 18th century poet Thomas Gray is responsible for the often quoted phrase, "Where ignorance is bliss, 'tis folly to be wise." President Thomas Jefferson embellished that quotation with one of his own when he said, "If ignorance is bliss, why aren't more people happy?" — a line that British comedy writers John Lloyd and John Mitchinson co-opted for the title of their new anthology of quotations.

Lloyd and Mitchinson talk with Liane Hansen about their third book together, titled If Ignorance Is Bliss ... Why Aren't There More Happy People?. It follows The Book of General Ignorance and The Book of Animal Ignorance.

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