In the 20th century, Arabic language material was scarce. During the Vietnam War, Reginald Hefner, had access to a language lab of the US military - and later discovered, how the Military's Arabic material was used by publishers around the world. He shares some reminiscences and anecdotes in this guest article.
The Knight's Tour problem is a famous mathematical chess puzzle. The first solution provided an Arab philosopher in the 9th century from present-day Iraq.
The Arabic broken plural has the effect that scholars still debate how to properly classify the several branches of Semitic languages.