• Written by best-selling Portugese author Regina Gonçalves.
　　• Best fiction titles for learning in Europe.
　　• Korean, Spanish, French, English and Simplied Chinese rights are sold.
　　• Selected as text books by Brazilian Ministry of Education, famous private schools and the Instituto Nacional de Matemtica Pura Aplicada.
　　• About one million copies are sold.　
　　• A historical fiction series dedicated to young readers and adults. It is packed with mystery and suspense stories that combine and integrate a wide range of fields of knowledge, such as History, Art, Philosophy and Science.
　　• English samples are available.

　　12 titles in this series: Mathematics–What beast is this?, Ramses II and the Battle of Kadesh, Napoleon Bonaparte in Russia, Alexander and Aristotle, The Phantom of the Opera Carmen, Einstein, Picasso, Agatha and Chaplin, Hannibal and Archimedes, Santos Dumont - Flying is for everyone, The Emperor and the Journalist, Tutankhamun,Marco Polo's Travels, The angel of the great depression

one more title in the second semester of 2023- "Enigma Machine in the Battle of the Atlantic"- is an adventure of Caius Zip during the second world war, with battle between a submarine and a destroyer warship, the search for the encoding/decoding machine called Enigma, the first electronic computer in Bletchey Park, dialogues with the math genius Alan Turing, Espionage and more...

　　Caius Zip, a young time traveller, crosses unknown India with the Macedonian army led by the legendary Alexander, the Great, in 326 B.C..
　　Caius appears during a battle between Alexander and the Indian king, Porus. Caius gets acquainted with the striking personality of this invincible leader. Alexander has great human virtues, but he also has some important flaws.
　　The young time traveller also discovers the philosophy of great Greek thinkers, such as Thales, Anaximander, Pythagoras, Democritus, Heraclites, Socrates, Plato and, above all, Aristotle. Although Aristotle is not among the Greeks in India, he is constantly mentioned in the story and represented by his nephew and disciple Callisthenes, who joined the army of Alexander as a historian. It is as if Aristotle were speaking from the mouth of Callisthenes, with whom Caius learns the principles of Greek philosophy and perceives how our manner of thinking is highly influenced by the Greek thinkers who lived 2500 years ago.Alongside the lovely Daphne, with whom he falls in love, Caius learns Aristotle´s principles of logic.
　　With Alexander, before the gods Shiva, Zeus, Amon and Ahura Mazda, Caius must face the difficult challenge of the six black pearls proposed by the gods, on which their lives will depend. And so, Caius Zip experiences this magical period of encounters between civilizations that profoundly marked the history of the world.
　　At the end, the book includes a highly original biography in the form of imaginary memories of Alexander.

Regina Gonçalves
　　Regina has a degree in mathematics and systems analysis but decided not to pursue her profession in order to dedicate her time to teaching her daughters and other adolescents. She wrote textbooks with stories that combined the study of history with mathematics.
　　As these stories expanded, Regina found herself dedicating more and more of her time to writing and eventually completed a series of books about the young “Caius Zip – The Time Traveller,” for young readers and adults who are still young at heart.
　　Her works of fiction always aim at providing information and arousing the reader’s curiosity concerning matters of world history, art, philosophy and science. Mathematics has always been present in the solution of enigmas, and decision making in epic battles and during the investigation of a mystery.