Pythagoras and his famous Theorem -- Proving the Pythagorean Theorem without (many) words -- Applications of the Pythagorean Theorem -- Pythagorean triples and their properties -- The Pythagorean means -- Tuning the soul : Pythagoras and music -- The Pythagorean Theorem in fractal art -- About the mathematics work that led to the 1985 Nobel Prize in Chemistry : thanks ultimately to Pythagoras / by Herbert A. Hauptman -- Pictorial depictions of Pythagoras and his famous Theorem -- Appendix A. Some selected proofs -- Appendix B. Some more proofs and solutions -- Appendix C. List of primitive Pythagorean triples -- Appendix D. List of Pythagorean triples : primitive and nonprimitive.