The free physics text for students, teachers and enthusiasts available on www.motionmountain.net has been considerably extended. It adds a new section on nuclear physics that includes the story of radioactivity, a MRI scan of humans making love and the dream of grand unification. The present 14th revision also adds more figures on special relativity, a short explanation of k calculus, the paradox of the relativistic submarine, a photograph and description of how some caterpillars shoot away their faecal matter, a photograph of a basilisk running over water, Stowe's periodic table of the elements, a beautiful picture of the analemma, references to monadology, the question why birds are not usually seen on high voltage lines, the question whether the moon is larger or smaller than the nail of your thumb at the end of your extended arm, the proof that Peary did not reach the north pole, and much more. Many photographs and drawings have been added, the graphical presentation reworked and several hundred challenge solutions have been added. (Tell me which ones you want next!) For all fields of physics the newest research results and the main unanswered questions are presented. The text remains a structured walk through classical physics, relativity, quantum theory and unification. In total, the text aims to give an overview of what motion is and what it can effect. The accent on surprises and thought-provoking puzzles has been kept. It will please both readers who open the text at random and those who read it systematically. Thank you to everybody who has sent criticisms, corrections and suggestions. Enjoy! Christoph Schiller chri_schiller @ yahoo . com P.S. In physics texts, figures take the biggest part of the budget - both in time and in money. Any help on (preferably colour postscript) images to be added to the text (with permission of course) is much appreciated. Such help will allow me to concentrate on the writing and make sure that the text can continue to be free for all readers throughout the world.