The National Park Service is over 100 years old! How many of our beautiful national parks have you been to? Enjoy free ...

French mathematician Édouard Lucas was born in Amiens in 1842 and died in Paris 49 years later. He wrote the four-volume work Recréations Mathématiques, which became a classic of recreational ...

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Puzzles were first included in 2015 and have become an annual tradition. The card can be downloaded from the GCHQ website, and has become popular with teachers — the agency says a third of ...