Right in the first chapter there is a glaring mistake, which gives me pause regarding the accuracy of the rest of the book. The authour mentions that society didn't know or believe the Earth is a sphere until 1492. This is not even remotely accurate. Only fringes of society ever believed the Earth was flat, as far back as the written word can be traced. Even the Christian-Judaic scriptures mention the "circle of the Earth", except that in the original language, there is no distinction between the word circle and sphere. So, even religious texts support the concept that Earth may be a sphere. Pythagoras mentioned the Earth was a sphere, as did Parmenides and Aristotle, 2500 years ago. Even a cursory search on the Internet can find these and other examples. So, take what you read in this book with a grain of salt, rather than trusting it to be scientifically accurate.