When the book was written (in an obviously commercial ends) at the end of the 50s, Europe was still recovering from the trauma of the Second World War. The need to escape the memories of conflict and everyday still difficult (the war in Algeria raged for over 5 years) were great. In short, the audience was ready to swallow a New Age mush, tote, poorly constructed, poorly documented and often dishonest; are thus placed on the same level of the facts "sometimes true and sometimes caption (s)" ... Where the bottom really hurts and you leave the pranks for the nauseous is when the authors explain Nazism by esoteric beliefs (see Hörbiger and ice theory, hollow earth, giant sleeping .. .). Hitler would have been fooled by his naivety ... There are things we can not explain and apologize so easily !!! Fortunately, this beautiful book title has greatly aged and new generations will smile ...