• 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...

　　This journey in time starts with Caius Zip, the time traveller, in a forest in the outskirts of Paris, where he helps a pilot climb out of this strange flying machine that resembles a modern light aircraft. The small plane is stuck on top of a tree after a forced landing.
　　It is 1909 and the bubbling cultural, artistic and technological scenario of Paris is like no other in the world. A time thinking boldly in all areas, of reflecting and transgressing the superficial order of things. Consequently, you’ll see historical persons such as Eiffel, Proust, Matisse, Freud and Nijinsky “flying” to achieve their dreams.
　　In addition to Santos Dumont, who is immersed in his latest machine, the light aircraft Demoiselle, and the interesting characters that Caius meets in the field of technology, there are also incredible individuals who are revolutionizing other areas. Caius flies over Paris in the smallest dirigible built by Santos Dumont, called La Balladeuse, sometimes accompanied by the young and charming Valquiria, for whom he develops a crush, and other times accompanied by his small friend Tonio, who dreams of becoming a pilot. Who is this 9 year-old boy who will be famous in the future?
　　Later, Caius accompanies the great aviation week of Champagne – the first international aviation tournament – and then he visits the 1st aviation exhibition hall in the Grand Palais, Paris. There are also some surprising revelations about who invented the airplane, the pioneers and their contributions and patent wars.

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.