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.

Cats have over one hundred vocal sounds, dogs only have about ten.

The triangular shape that Toblerone chocolates are packaged in, is protected by law.

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