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.

One billion seconds is about 32 years.

Approximately 16,500 people in the U.S. go by the last name Lemon.

AMAZING FACTS