It was this work that Muhammad ibn-Musa al-Khwarizmi in the 9th century was to expand on so successfully. Khwarizmi became known as “the father of algebra” and gave his name to algorithms. The same ...

Want to count your money in Cyrillic style? Discover why the Slavs saw a flock of ravens in a million and darkness in 1,000 million. You’re probably well aware of the existence of various systems of ...