The dark side of human history + When did human history begin? - Since people know the symbols or letters + When is it? - Approximately the year 2300 BC, historians estimate that year but exactly how human recognize letters or symbols that no one would know. + So before that man does deserve to be called human? - It depends on what is called human. + So what is a human? - In this context it could be called that man is the creature who already know what a symbol or letter to be continued.