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 ...

The Mexican ("Aztec") 365-day calendar and the Western Maya (Yucatec) 365 day calendar in use at the time of the Spanish conquests of Mexico and the Yucatan have an invariable relation to each other.