Next, I will discuss questions the Standard Model raises but cannot answer.
I will review the evidence for quarks and leptons as fundamental constituents and explain the strategy of gauge theories of the fundamental interactions. My first order of business will be to summarize the microscopic description of matter to which we have come in the past twenty years.
The new insights embodied in the Standard Model of elementary-particle physics not only provide a framework for describing and understanding the world around us, but also elucidate the first instants after the creation of the universe. All known natural phenomena can be described in terms of a few fundamental forces acting among these basic constitutents. We have learned that all matter in its diverse forms is assembled from a few building blocks called quarks and leptons. This progress has, in large measure, been stimulated by experimental results from particle accelerators, instruments of the kind given to use by Bernard Gregory and his colleagues. Over the past two decades, the age-old struggle to describe and comprehend the nature of elementary particles and forces has been rewarded by a radically new and simple picture of Nature.
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