The American children's television programme Sesame Street is celebrating its 40th anniversary today.
On this side of the Atlantic the puppets are best-known for leading to the creation of the Muppet Show, but in the United States and more than 100 other countries around the world they are an important part of early childhood.
Correspondent Kevin Connolly reports from the original New York Street set where 4,000 episodes of the programme were produced.
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