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The Simpsons celebrates 20 years and is still going strong... The makers tell us how they do it

The Simpsons From Mail on Sunday By Lee Coan

Published 3 January 2010

Twenty years ago, the first full-length episode of The Simpsons aired on America's Fox network and the yellow-skinned family - based on creator Matt Groening's own - began their unstoppable march to world domination. Today, 442 episodes, one feature film, three albums, five computer games, one theme park ride and one set of U.S. stamps later, The Simpsons is one of the most profitable entertainment properties in history, having netted around $3 billion (£1.8 billion)…