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.

Due to the deforestation of the forests in North China, over one million tons of sands blows into Beijing from the Gobi desert. It sometimes causes the sky to turn yellow.

About 50 % of men masturbate once a day, 75% at once a week, and 99& at least once a month.

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