It has long been a mystery of Aztec arithmetic: What is three arms plus five bones? Now researchers know: Five hearts. The odd symbols had been noted for centuries; thousands of them appear in Aztec ...

It has long been a mystery of Aztec arithmetic: What is three arms plus five bones? Now researchers know: five hearts. The odd symbols had been noted for centuries -- thousands of them appear in Aztec ...

Using written symbols such as hearts, arrows and hands, the ancient Aztecs maintained an arithmetic system that was far more complex than previously understood, scientists said on Thursday. The Aztecs ...

Long known for their cool circular calendars and practice of human sacrifice, Aztecs were also math whizzes. Subscribe to read this story ad-free Get unlimited access to ad-free articles and exclusive ...