For years, the interest in understanding life, its origins and its evolution has resonated in the head of Juan José Millás, so he set out to know, together with one of the greatest specialists in este country in the field, Juan Luis Arsuaga, why we are the way we are and what has led us to where we are. The wisdom of the paleontologist is combined in este book with the ingenuity and the personal and surprising look that the writer has on reality. Because Millás is a Neanderthal (or so he says), and Arsuaga, in his eyes, a sapiens.