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.

The five Olympic rings represent the five continents linked together in friendship.

Scientists have discovered that the longer the ring finger is in boys the less chance they have of having a heart attack.

AMAZING FACTS