What is the real meaning of the strange symbols engraved in a northeastern Brazils stone?

A work created by aliens from outer space? A monument that proves the presence of the Phoenicians in the Americas? An encoded atomic energy formula developed thousands of years ago? Many theories have been developed in order to explain this masterpiece of the prehistoric past. Roberto Salgado de Carvalho presents ethnological evidence about the true meaning of the engravings that puzzled researchers and the public all over the world in his fascinating new book The Mysterious Stone.