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 first modern toothbrush was invented in China. Its bristles came from hogs hair or the mane of a horse that were then put into ivory handles.

Albert Einstein was offered the presidency of Israel in 1952, but he declined.

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