The American children's television programme Sesame Street is celebrating its 40th anniversary.
On this side of the Atlantic the puppets are perhaps best-known for leading to the creation of the Muppet Show but in the United States and more than a hundred other countries around the world they are an important part of early childhood.
Correspondent Kevin Connolly went to the original New York Street set where 4,000 episodes of the programme have been produced to speak to one of their most famous creations.
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