For the last 20 years, Chantal Jegues-Wolkiewiez, an independent astronomer and ethnologist, has lead a rigorous investigation to prove her theory. According to her studies, hunter gatherers spent long nights observing the sky, calculating, and recording their discoveries either on the walls of caves or on animal bones. Thanks to their analyses they could measure time and adapt to weather change. In this film, she shares her stunning conclusions, Prehistoric men chose their caves according to the orientation of the sun, created measuring tools such as a lunar calendar, and their wall paintings were the first maps of the sky and stars. Today, these fascinating discoveries are gradually gaining respect in the international science community.