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.

In 1924, Kleenex tissues were originally designed as a cold cream remover.

A snail can slide over a razor blade without being hurt by producing slime that helps it slide harmlessly.

AMAZING FACTS