"Holy Grail and Modern Science as Duality" reveals essential aspects about fundamental knowledge. Human mind at some time or another becomes inquisitive about its own nature. In the long, tedious search humanity went thru, some, did have the chance to acquire ancient sources of information. Among the inquiring minds that had such opportunity were the pioneers of our modern science as Newton, Mendel and Mendeleyev. Their work was extremely controversial for their times and therefore was accepted as scientific only decades later. Newton's apple and Eve's apple are linked to knowledge that comes to us from outside sources. The apple seems to be an ancient symbol for knowledge. Maybe in the near future our modern science will accept and embrace the fact that knowledge comes to us from ancient sources. For the time being, humanity might be too proud to accept the simple idea, that; everything that is being discovered existed prior to its discovery. This book will help one understand why our modern science rests "on the shoulders of the giants" as Newton claimed about its own work. Most readers will find the ideas in this book as novelty, therefore very intriguing and controversial.