The UK's best selling hiking magazine published faulty coordinates for descending Scotland's tallest peak (Ben Nevis), and recommended a route that leads climbers off the edge of a cliff.

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 porpoise is second to man as the most intelligent animal on the planet.

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