Used for water distribution, the Delaware Aqueduct in New York, USA is the longest tunnel in the world (as of 2010). Drilled through solid rock, it reaches a staggering 137 kilometres (85 miles) in length. More tunnel facts.

Other than London, Liverpool is the most filmed British city, and was used to film more than 140 films in 2002.

At birth a human has 350 bones, but only 206 bones when full grown.

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