The second volume of the trilogy Beyond Homo Sapiens--Doubt, explores and interprets the historical events from the discovery of America to the end of the 19th Century. Enlightenment began with the acceptance by a majority of the world's population that the Earth rotates around the Sun. Symbolically, it meant that our minds became centered on the Light of wisdom instead of the darkness of ignorance. Mariú Suarez, the author, shows us how Homo sapiens managed to gain more tools with the marriage of science and crafts. However, his biological automatic reactions of self defense, immediate gratification and drive to reproduce have been left untouched, perpetuating and making even less human the world in which we live. Spiritual insight continued to be absent from our daily lives. Mariú explains how two classic fiction characters of the time exemplified the inner struggle of mankind to leave behind blind faith. Don Quixote's Cervantes, and Hamlet's Shakespeare. Mariú makes clear, Cervantes wrote about the world of blind faith and feudalism in decline, while Shakespeare explored with Hamlet the world of the bourgeoisie and doubt in ascendance.