In this book for children aged 8 and up, 333 strictly secret events, mysterious phenomena, and puzzling cases are examined in detail. Whether it's history, science, technology, criminology, or mythology – numerous secrets from each field are revealed, accompanied by background information. 333 x secret knowledge for kids: incomprehensible, puzzling, and strictly confidential! What lies behind the curse of Tutankhamun? How does a lie detector work? Who was the man in the iron mask? What is a mirage? Where do vampires come from? What disappears in the Bermuda Triangle? Exciting extras include a spy fitness program, experiments, secret codes, puzzles, magic tricks, and much more.