I've just begun a wonderful voyage through the realms of the smallest entities of energy or matter (how ever one wants to see these building blocks of the world at large). Nobody, whatever the background, can remain calm and disengaged with professor Griffiths unfolding the spectrum of particles. It is his exceptional talent to word his messages such that they find their way directly to the grey cells of the reader. So far, for my way of thinking, the best written book on topics of physics was "The Fabric of the Cosmos" by Brian Green. Now there is a second book on this shelve of "most pleasure to read": "Introduction to Elementary Particles" by David J. Griffiths