Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Standard Model of particle physics is a theory concerning the electromagnetic, weak, and strong nuclear interactions, which mediate the dynamics of the known subatomic particles. Developed throughout the mid to late 20th century, the current formulation was finalized in the mid 1970s upon experimental confirmation of the existence of quarks. Since then, discoveries of the bottom quark, the top quark, and the tau neutrino have given further credence to the Standard Model. More recently, the apparent detection of the Higgs boson completes the set of predicted particles. Learn more about currently the best tested theory of what the world is and what holds it together, the Standard Model in this book.